Informal standard M. Nilsson
Document: id3v2-00.txt 26th March 1998
ID3 tag version 2
Status of this document
This document is an Informal standard and is released so that
implementors could have a set standard before the formal standard is
set. The formal standard will use another version number if not
identical to what is described in this document. The contents in this
document may change for clarifications but never for added or altered
functionallity.
Distribution of this document is unlimited.
Abstract
The recent gain of popularity for MPEG layer III audio files on the
internet forced a standardised way of storing information about an
audio file within itself to determinate its origin and contents.
Today the most accepted way to do this is with the so called ID3 tag,
which is simple but very limited and in some cases very unsuitable.
The ID3 tag has very limited space in every field, very limited
numbers of fields, not expandable or upgradeable and is placed at the
end of a the file, which is unsuitable for streaming audio. This draft
is an attempt to answer these issues with a new version of the ID3
tag.
1. Table of contents
2. Conventions in this document
3. ID3v2 overview
3.1. ID3v2 header
3.2. ID3v2 frames overview
4. Declared ID3v2 frames
4.1. Unique file identifier
4.2. Text information frames
4.2.1. Text information frames - details
4.2.2. User defined text information frame
4.3. URL link frames
4.3.1. URL link frames - details
4.3.2. User defined URL link frame
4.4. Involved people list
4.5. Music CD Identifier
4.6. Event timing codes
4.7. MPEG location lookup table
4.8. Synced tempo codes
4.9. Unsychronised lyrics/text transcription
4.10. Synchronised lyrics/text
4.11. Comments
4.12. Relative volume adjustment
4.13. Equalisation
4.14. Reverb
4.15. Attached picture
4.16. General encapsulated object
4.17. Play counter
4.18. Popularimeter
4.19. Recommended buffer size
4.20. Encrypted meta frame
4.21. Audio encryption
4.22. Linked information
5. The 'unsynchronisation scheme'
6. Copyright
7. References
8. Appendix
A. Appendix A - ID3-Tag Specification V1.1
A.1. Overview
A.2. ID3v1 Implementation
A.3. Genre List
A.4. Track addition - ID3v1.1
9. Author's Address
2. Conventions in this document
In the examples, text within "" is a text string exactly as it appears
in a file. Numbers preceded with $ are hexadecimal and numbers
preceded with % are binary. $xx is used to indicate a byte with
unknown content. %x is used to indicate a bit with unknown content.
The most significant bit (MSB) of a byte is called 'bit 7' and the
least significant bit (LSB) is called 'bit 0'.
A tag is the whole tag described in this document. A frame is a block
of information in the tag. The tag consists of a header, frames and
optional padding. A field is a piece of information; one value, a
string etc. A numeric string is a string that consists of the
characters 0-9 only.
3. ID3v2 overview
The two biggest design goals were to be able to implement ID3v2
without disturbing old software too much and that ID3v2 should be
expandable.
The first criterion is met by the simple fact that the MPEG [MPEG]
decoding software uses a syncsignal, embedded in the audiostream, to
'lock on to' the audio. Since the ID3v2 tag doesn't contain a valid
syncsignal, no software will attempt to play the tag. If, for any
reason, coincidence make a syncsignal appear within the tag it will be
taken care of by the 'unsynchronisation scheme' described in section
5.
The second criterion has made a more noticeable impact on the design
of the ID3v2 tag. It is constructed as a container for several
information blocks, called frames, whose format need not be known to
the software that encounters them. At the start of every frame there
is an identifier that explains the frames's format and content, and a
size descriptor that allows software to skip unknown frames.
If a total revision of the ID3v2 tag should be needed, there is a
version number and a size descriptor in the ID3v2 header.
The ID3 tag described in this document is mainly targeted to files
encoded with MPEG-2 layer I, MPEG-2 layer II, MPEG-2 layer III and
MPEG-2.5, but may work with other types of encoded audio.
The bitorder in ID3v2 is most significant bit first (MSB). The
byteorder in multibyte numbers is most significant byte first (e.g.
$12345678 would be encoded $12 34 56 78).
It is permitted to include padding after all the final frame (at the
end of the ID3 tag), making the size of all the frames together
smaller than the size given in the head of the tag. A possible purpose
of this padding is to allow for adding a few additional frames or
enlarge existing frames within the tag without having to rewrite the
entire file. The value of the padding bytes must be $00.
3.1. ID3v2 header
The ID3v2 tag header, which should be the first information in the
file, is 10 bytes as follows:
ID3/file identifier "ID3"
ID3 version $02 00
ID3 flags %xx000000
ID3 size 4 * %0xxxxxxx
The first three bytes of the tag are always "ID3" to indicate that
this is an ID3 tag, directly followed by the two version bytes. The
first byte of ID3 version is it's major version, while the second byte
is its revision number. All revisions are backwards compatible while
major versions are not. If software with ID3v2 and below support
should encounter version three or higher it should simply ignore the
whole tag. Version and revision will never be $FF.
The first bit (bit 7) in the 'ID3 flags' is indicating whether or not
unsynchronisation is used (see section 5 for details); a set bit
indicates usage.
The second bit (bit 6) is indicating whether or not compression is
used; a set bit indicates usage. Since no compression scheme has been
decided yet, the ID3 decoder (for now) should just ignore the entire
tag if the compression bit is set.
The ID3 tag size is encoded with four bytes where the first bit (bit
7) is set to zero in every byte, making a total of 28 bits. The zeroed
bits are ignored, so a 257 bytes long tag is represented as $00 00 02
01.
The ID3 tag size is the size of the complete tag after
unsychronisation, including padding, excluding the header (total tag
size - 10). The reason to use 28 bits (representing up to 256MB) for
size description is that we don't want to run out of space here.
A ID3v2 tag can be detected with the following pattern:
$49 44 33 yy yy xx zz zz zz zz
Where yy is less than $FF, xx is the 'flags' byte and zz is less than
$80.
3.2. ID3v2 frames overview
The headers of the frames are similar in their construction. They
consist of one three character identifier (capital A-Z and 0-9) and
one three byte size field, making a total of six bytes. The header is
excluded from the size. Identifiers beginning with "X", "Y" and "Z"
are for experimental use and free for everyone to use. Have in mind
that someone else might have used the same identifier as you. All
other identifiers are either used or reserved for future use.
The three character frame identifier is followed by a three byte size
descriptor, making a total header size of six bytes in every frame.
The size is calculated as framesize excluding frame identifier and
size descriptor (frame size - 6).
There is no fixed order of the frames' appearance in the tag, although
it is desired that the frames are arranged in order of significance
concerning the recognition of the file. An example of such order:
UFI, MCI, TT2 ...
A tag must contain at least one frame. A frame must be at least 1 byte
big, excluding the 6-byte header.
If nothing else is said a string is represented as ISO-8859-1
[ISO-8859-1] characters in the range $20 - $FF. All unicode strings
[UNICODE] use 16-bit unicode 2.0 (ISO/IEC 10646-1:1993, UCS-2). All
numeric strings are always encoded as ISO-8859-1. Terminated strings
are terminated with $00 if encoded with ISO-8859-1 and $00 00 if
encoded as unicode. If nothing else is said newline character is
forbidden. In ISO-8859-1 a new line is represented, when allowed, with
$0A only. Frames that allow different types of text encoding have a
text encoding description byte directly after the frame size. If
ISO-8859-1 is used this byte should be $00, if unicode is used it
should be $01.
The three byte language field is used to describe the language of the
frame's content, according to ISO-639-2 [ISO-639-2].
All URLs [URL] may be relative, e.g. "picture.png", "../doc.txt".
If a frame is longer than it should be, e.g. having more fields than
specified in this document, that indicates that additions to the
frame have been made in a later version of the ID3 standard. This
is reflected by the revision number in the header of the tag.
4. Declared ID3v2 frames
The following frames are declared in this draft.
4.19 BUF Recommended buffer size
4.17 CNT Play counter
4.11 COM Comments
4.21 CRA Audio encryption
4.20 CRM Encrypted meta frame
4.6 ETC Event timing codes
4.13 EQU Equalization
4.16 GEO General encapsulated object
4.4 IPL Involved people list
4.22 LNK Linked information
4.5 MCI Music CD Identifier
4.7 MLL MPEG location lookup table
4.15 PIC Attached picture
4.18 POP Popularimeter
4.14 REV Reverb
4.12 RVA Relative volume adjustment
4.10 SLT Synchronized lyric/text
4.8 STC Synced tempo codes
4.2.1 TAL Album/Movie/Show title
4.2.1 TBP BPM (Beats Per Minute)
4.2.1 TCM Composer
4.2.1 TCO Content type
4.2.1 TCR Copyright message
4.2.1 TDA Date
4.2.1 TDY Playlist delay
4.2.1 TEN Encoded by
4.2.1 TFT File type
4.2.1 TIM Time
4.2.1 TKE Initial key
4.2.1 TLA Language(s)
4.2.1 TLE Length
4.2.1 TMT Media type
4.2.1 TOA Original artist(s)/performer(s)
4.2.1 TOF Original filename
4.2.1 TOL Original Lyricist(s)/text writer(s)
4.2.1 TOR Original release year
4.2.1 TOT Original album/Movie/Show title
4.2.1 TP1 Lead artist(s)/Lead performer(s)/Soloist(s)/Performing group
4.2.1 TP2 Band/Orchestra/Accompaniment
4.2.1 TP3 Conductor/Performer refinement
4.2.1 TP4 Interpreted, remixed, or otherwise modified by
4.2.1 TPA Part of a set
4.2.1 TPB Publisher
4.2.1 TRC ISRC (International Standard Recording Code)
4.2.1 TRD Recording dates
4.2.1 TRK Track number/Position in set
4.2.1 TSI Size
4.2.1 TSS Software/hardware and settings used for encoding
4.2.1 TT1 Content group description
4.2.1 TT2 Title/Songname/Content description
4.2.1 TT3 Subtitle/Description refinement
4.2.1 TXT Lyricist/text writer
4.2.2 TXX User defined text information frame
4.2.1 TYE Year
4.1 UFI Unique file identifier
4.9 ULT Unsychronized lyric/text transcription
4.3.1 WAF Official audio file webpage
4.3.1 WAR Official artist/performer webpage
4.3.1 WAS Official audio source webpage
4.3.1 WCM Commercial information
4.3.1 WCP Copyright/Legal information
4.3.1 WPB Publishers official webpage
4.3.2 WXX User defined URL link frame
4.1. Unique file identifier
This frame's purpose is to be able to identify the audio file in a
database that may contain more information relevant to the content.
Since standardisation of such a database is beyond this document, all
frames begin with a null-terminated string with a URL [URL] containing
an email address, or a link to a location where an email address can
be found, that belongs to the organisation responsible for this
specific database implementation. Questions regarding the database
should be sent to the indicated email address. The URL should not be
used for the actual database queries. If a $00 is found directly after
the 'Frame size' the whole frame should be ignored, and preferably be
removed. The 'Owner identifier' is then followed by the actual
identifier, which may be up to 64 bytes. There may be more than one
"UFI" frame in a tag, but only one with the same 'Owner identifier'.
Unique file identifier "UFI"
Frame size $xx xx xx
Owner identifier <textstring> $00
Identifier <up to 64 bytes binary data>
4.2. Text information frames
The text information frames are the most important frames, containing
information like artist, album and more. There may only be one text
information frame of its kind in an tag. If the textstring is followed
by a termination ($00 (00)) all the following information should be
ignored and not be displayed. All the text information frames have the
following format:
Text information identifier "T00" - "TZZ" , excluding "TXX",
described in 4.2.2.
Frame size $xx xx xx
Text encoding $xx
Information <textstring>
4.2.1. Text information frames - details
TT1
The 'Content group description' frame is used if the sound belongs to
a larger category of sounds/music. For example, classical music is
often sorted in different musical sections (e.g. "Piano Concerto",
"Weather - Hurricane").
TT2
The 'Title/Songname/Content description' frame is the actual name of
the piece (e.g. "Adagio", "Hurricane Donna").
TT3
The 'Subtitle/Description refinement' frame is used for information
directly related to the contents title (e.g. "Op. 16" or "Performed
live at wembley").
TP1
The 'Lead artist(s)/Lead performer(s)/Soloist(s)/Performing group' is
used for the main artist(s). They are seperated with the "/"
character.
TP2
The 'Band/Orchestra/Accompaniment' frame is used for additional
information about the performers in the recording.
TP3
The 'Conductor' frame is used for the name of the conductor.
TP4
The 'Interpreted, remixed, or otherwise modified by' frame contains
more information about the people behind a remix and similar
interpretations of another existing piece.
TCM
The 'Composer(s)' frame is intended for the name of the composer(s).
They are seperated with the "/" character.
TXT
The 'Lyricist(s)/text writer(s)' frame is intended for the writer(s)
of the text or lyrics in the recording. They are seperated with the
"/" character.
TLA
The 'Language(s)' frame should contain the languages of the text or
lyrics in the audio file. The language is represented with three
characters according to ISO-639-2. If more than one language is used
in the text their language codes should follow according to their
usage.
TCO
The content type, which previously (in ID3v1.1, see appendix A) was
stored as a one byte numeric value only, is now a numeric string. You
may use one or several of the types as ID3v1.1 did or, since the
category list would be impossible to maintain with accurate and up to
date categories, define your own.
References to the ID3v1 genres can be made by, as first byte, enter
"(" followed by a number from the genres list (section A.3.) and
ended with a ")" character. This is optionally followed by a
refinement, e.g. "(21)" or "(4)Eurodisco". Several references can be
made in the same frame, e.g. "(51)(39)". If the refinement should
begin with a "(" character it should be replaced with "((", e.g. "((I
can figure out any genre)" or "(55)((I think...)". The following new
content types is defined in ID3v2 and is implemented in the same way
as the numerig content types, e.g. "(RX)".
RX Remix
CR Cover
TAL
The 'Album/Movie/Show title' frame is intended for the title of the
recording(/source of sound) which the audio in the file is taken from.
TPA
The 'Part of a set' frame is a numeric string that describes which
part of a set the audio came from. This frame is used if the source
described in the "TAL" frame is divided into several mediums, e.g. a
double CD. The value may be extended with a "/" character and a
numeric string containing the total number of parts in the set. E.g.
"1/2".
TRK
The 'Track number/Position in set' frame is a numeric string
containing the order number of the audio-file on its original
recording. This may be extended with a "/" character and a numeric
string containing the total numer of tracks/elements on the original
recording. E.g. "4/9".
TRC
The 'ISRC' frame should contian the International Standard Recording
Code [ISRC].
TYE
The 'Year' frame is a numeric string with a year of the recording.
This frames is always four characters long (until the year 10000).
TDA
The 'Date' frame is a numeric string in the DDMM format containing
the date for the recording. This field is always four characters
long.
TIM
The 'Time' frame is a numeric string in the HHMM format containing
the time for the recording. This field is always four characters
long.
TRD
The 'Recording dates' frame is a intended to be used as complement to
the "TYE", "TDA" and "TIM" frames. E.g. "4th-7th June, 12th June" in
combination with the "TYE" frame.
TMT
The 'Media type' frame describes from which media the sound
originated. This may be a textstring or a reference to the predefined
media types found in the list below. References are made within "("
and ")" and are optionally followed by a text refinement, e.g. "(MC)
with four channels". If a text refinement should begin with a "("
character it should be replaced with "((" in the same way as in the
"TCO" frame. Predefined refinements is appended after the media type,
e.g. "(CD/S)" or "(VID/PAL/VHS)".
DIG Other digital media
/A Analog transfer from media
ANA Other analog media
/WAC Wax cylinder
/8CA 8-track tape cassette
CD CD
/A Analog transfer from media
/DD DDD
/AD ADD
/AA AAD
LD Laserdisc
/A Analog transfer from media
TT Turntable records
/33 33.33 rpm
/45 45 rpm
/71 71.29 rpm
/76 76.59 rpm
/78 78.26 rpm
/80 80 rpm
MD MiniDisc
/A Analog transfer from media
DAT DAT
/A Analog transfer from media
/1 standard, 48 kHz/16 bits, linear
/2 mode 2, 32 kHz/16 bits, linear
/3 mode 3, 32 kHz/12 bits, nonlinear, low speed
/4 mode 4, 32 kHz/12 bits, 4 channels
/5 mode 5, 44.1 kHz/16 bits, linear
/6 mode 6, 44.1 kHz/16 bits, 'wide track' play
DCC DCC
/A Analog transfer from media
DVD DVD
/A Analog transfer from media
TV Television
/PAL PAL
/NTSC NTSC
/SECAM SECAM
VID Video
/PAL PAL
/NTSC NTSC
/SECAM SECAM
/VHS VHS
/SVHS S-VHS
/BETA BETAMAX
RAD Radio
/FM FM
/AM AM
/LW LW
/MW MW
TEL Telephone
/I ISDN
MC MC (normal cassette)
/4 4.75 cm/s (normal speed for a two sided cassette)
/9 9.5 cm/s
/I Type I cassette (ferric/normal)
/II Type II cassette (chrome)
/III Type III cassette (ferric chrome)
/IV Type IV cassette (metal)
REE Reel
/9 9.5 cm/s
/19 19 cm/s
/38 38 cm/s
/76 76 cm/s
/I Type I cassette (ferric/normal)
/II Type II cassette (chrome)
/III Type III cassette (ferric chrome)
/IV Type IV cassette (metal)
TFT
The 'File type' frame indicates which type of audio this tag defines.
The following type and refinements are defined:
MPG MPEG Audio
/1 MPEG 2 layer I
/2 MPEG 2 layer II
/3 MPEG 2 layer III
/2.5 MPEG 2.5
/AAC Advanced audio compression
but other types may be used, not for these types though. This is used
in a similar way to the predefined types in the "TMT" frame, but
without parenthesis. If this frame is not present audio type is
assumed to be "MPG".
TBP
BPM is short for beats per minute, and is easily computed by
dividing the number of beats in a musical piece with its length. To
get a more accurate result, do the BPM calculation on the main-part
only. To acquire best result measure the time between each beat and
calculate individual BPM for each beat and use the median value as
result. BPM is an integer and represented as a numerical string.
TCR
The 'Copyright message' frame, which must begin with a year and a
space character (making five characters), is intended for the
copyright holder of the original sound, not the audio file itself. The
absence of this frame means only that the copyright information is
unavailable or has been removed, and must not be interpreted to mean
that the sound is public domain. Every time this field is displayed
the field must be preceded with "Copyright " (C) " ", where (C) is one
character showing a C in a circle.
TPB
The 'Publisher' frame simply contains the name of the label or
publisher.
TEN
The 'Encoded by' frame contains the name of the person or
organisation that encoded the audio file. This field may contain a
copyright message, if the audio file also is copyrighted by the
encoder.
TSS
The 'Software/hardware and settings used for encoding' frame
includes the used audio encoder and its settings when the file was
encoded. Hardware refers to hardware encoders, not the computer on
which a program was run.
TOF
The 'Original filename' frame contains the preferred filename for the
file, since some media doesn't allow the desired length of the
filename. The filename is case sensitive and includes its suffix.
TLE
The 'Length' frame contains the length of the audiofile in
milliseconds, represented as a numeric string.
TSI
The 'Size' frame contains the size of the audiofile in bytes
excluding the tag, represented as a numeric string.
TDY
The 'Playlist delay' defines the numbers of milliseconds of silence
between every song in a playlist. The player should use the "ETC"
frame, if present, to skip initial silence and silence at the end of
the audio to match the 'Playlist delay' time. The time is represented
as a numeric string.
TKE
The 'Initial key' frame contains the musical key in which the sound
starts. It is represented as a string with a maximum length of three
characters. The ground keys are represented with "A","B","C","D","E",
"F" and "G" and halfkeys represented with "b" and "#". Minor is
represented as "m". Example "Cbm". Off key is represented with an "o"
only.
TOT
The 'Original album/Movie/Show title' frame is intended for the title
of the original recording(/source of sound), if for example the music
in the file should be a cover of a previously released song.
TOA
The 'Original artist(s)/performer(s)' frame is intended for the
performer(s) of the original recording, if for example the music in
the file should be a cover of a previously released song. The
performers are seperated with the "/" character.
TOL
The 'Original Lyricist(s)/text writer(s)' frame is intended for the
text writer(s) of the original recording, if for example the music in
the file should be a cover of a previously released song. The text
writers are seperated with the "/" character.
TOR
The 'Original release year' frame is intended for the year when the
original recording, if for example the music in the file should be a
cover of a previously released song, was released. The field is
formatted as in the "TDY" frame.
4.2.2. User defined text information frame
This frame is intended for one-string text information concerning the
audiofile in a similar way to the other "T"xx frames. The frame body
consists of a description of the string, represented as a terminated
string, followed by the actual string. There may be more than one
"TXX" frame in each tag, but only one with the same description.
User defined... "TXX"
Frame size $xx xx xx
Text encoding $xx
Description <textstring> $00 (00)
Value <textstring>
4.3. URL link frames
With these frames dynamic data such as webpages with touring
information, price information or plain ordinary news can be added to
the tag. There may only be one URL [URL] link frame of its kind in an
tag, except when stated otherwise in the frame description. If the
textstring is followed by a termination ($00 (00)) all the following
information should be ignored and not be displayed. All URL link
frames have the following format:
URL link frame "W00" - "WZZ" , excluding "WXX"
(described in 4.3.2.)
Frame size $xx xx xx
URL <textstring>
4.3.1. URL link frames - details
WAF
The 'Official audio file webpage' frame is a URL pointing at a file
specific webpage.
WAR
The 'Official artist/performer webpage' frame is a URL pointing at
the artists official webpage. There may be more than one "WAR" frame
in a tag if the audio contains more than one performer.
WAS
The 'Official audio source webpage' frame is a URL pointing at the
official webpage for the source of the audio file, e.g. a movie.
WCM
The 'Commercial information' frame is a URL pointing at a webpage
with information such as where the album can be bought. There may be
more than one "WCM" frame in a tag.
WCP
The 'Copyright/Legal information' frame is a URL pointing at a
webpage where the terms of use and ownership of the file is described.
WPB
The 'Publishers official webpage' frame is a URL pointing at the
official wepage for the publisher.
4.3.2. User defined URL link frame
This frame is intended for URL [URL] links concerning the audiofile in
a similar way to the other "W"xx frames. The frame body consists of a
description of the string, represented as a terminated string,
followed by the actual URL. The URL is always encoded with ISO-8859-1
[ISO-8859-1]. There may be more than one "WXX" frame in each tag, but
only one with the same description.
User defined... "WXX"
Frame size $xx xx xx
Text encoding $xx
Description <textstring> $00 (00)
URL <textstring>
4.4. Involved people list
Since there might be a lot of people contributing to an audio file in
various ways, such as musicians and technicians, the 'Text
information frames' are often insufficient to list everyone involved
in a project. The 'Involved people list' is a frame containing the
names of those involved, and how they were involved. The body simply
contains a terminated string with the involvement directly followed by
a terminated string with the involvee followed by a new involvement
and so on. There may only be one "IPL" frame in each tag.
Involved people list "IPL"
Frame size $xx xx xx
Text encoding $xx
People list strings <textstrings>
4.5. Music CD Identifier
This frame is intended for music that comes from a CD, so that the CD
can be identified in databases such as the CDDB [CDDB]. The frame
consists of a binary dump of the Table Of Contents, TOC, from the CD,
which is a header of 4 bytes and then 8 bytes/track on the CD making a
maximum of 804 bytes. This frame requires a present and valid "TRK"
frame. There may only be one "MCI" frame in each tag.
Music CD identifier "MCI"
Frame size $xx xx xx
CD TOC <binary data>
4.6. Event timing codes
This frame allows synchronisation with key events in a song or sound.
The head is:
Event timing codes "ETC"
Frame size $xx xx xx
Time stamp format $xx
Where time stamp format is:
$01 Absolute time, 32 bit sized, using MPEG [MPEG] frames as unit
$02 Absolute time, 32 bit sized, using milliseconds as unit
Abolute time means that every stamp contains the time from the
beginning of the file.
Followed by a list of key events in the following format:
Type of event $xx
Time stamp $xx (xx ...)
The 'Time stamp' is set to zero if directly at the beginning of the
sound or after the previous event. All events should be sorted in
chronological order. The type of event is as follows:
$00 padding (has no meaning)
$01 end of initial silence
$02 intro start
$03 mainpart start
$04 outro start
$05 outro end
$06 verse begins
$07 refrain begins
$08 interlude
$09 theme start
$0A variation
$0B key change
$0C time change
$0D unwanted noise (Snap, Crackle & Pop)
$0E-$DF reserved for future use
$E0-$EF not predefined sync 0-F
$F0-$FC reserved for future use
$FD audio end (start of silence)
$FE audio file ends
$FF one more byte of events follows (all the following bytes with
the value $FF have the same function)
The 'Not predefined sync's ($E0-EF) are for user events. You might
want to synchronise your music to something, like setting of an
explosion on-stage, turning on your screensaver etc.
There may only be one "ETC" frame in each tag.
4.7. MPEG location lookup table
To increase performance and accuracy of jumps within a MPEG [MPEG]
audio file, frames with timecodes in different locations in the file
might be useful. The ID3 frame includes references that the software
can use to calculate positions in the file. After the frame header is
a descriptor of how much the 'frame counter' should increase for every
reference. If this value is two then the first reference points out
the second frame, the 2nd reference the 4th frame, the 3rd reference
the 6th frame etc. In a similar way the 'bytes between reference' and
'milliseconds between reference' points out bytes and milliseconds
respectively.
Each reference consists of two parts; a certain number of bits, as
defined in 'bits for bytes deviation', that describes the difference
between what is said in 'bytes between reference' and the reality and
a certain number of bits, as defined in 'bits for milliseconds
deviation', that describes the difference between what is said in
'milliseconds between reference' and the reality. The number of bits
in every reference, i.e. 'bits for bytes deviation'+'bits for
milliseconds deviation', must be a multiple of four. There may only be
one "MLL" frame in each tag.
Location lookup table "MLL"
ID3 frame size $xx xx xx
MPEG frames between reference $xx xx
Bytes between reference $xx xx xx
Milliseconds between reference $xx xx xx
Bits for bytes deviation $xx
Bits for milliseconds dev. $xx
Then for every reference the following data is included;
Deviation in bytes %xxx....
Deviation in milliseconds %xxx....
4.8. Synced tempo codes
For a more accurate description of the tempo of a musical piece this
frame might be used. After the header follows one byte describing
which time stamp format should be used. Then follows one or more tempo
codes. Each tempo code consists of one tempo part and one time part.
The tempo is in BPM described with one or two bytes. If the first byte
has the value $FF, one more byte follows, which is added to the first
giving a range from 2 - 510 BPM, since $00 and $01 is reserved. $00 is
used to describe a beat-free time period, which is not the same as a
music-free time period. $01 is used to indicate one single beat-stroke
followed by a beat-free period.
The tempo descriptor is followed by a time stamp. Every time the tempo
in the music changes, a tempo descriptor may indicate this for the
player. All tempo descriptors should be sorted in chronological order.
The first beat-stroke in a time-period is at the same time as the beat
description occurs. There may only be one "STC" frame in each tag.
Synced tempo codes "STC"
Frame size $xx xx xx
Time stamp format $xx
Tempo data <binary data>
Where time stamp format is:
$01 Absolute time, 32 bit sized, using MPEG [MPEG] frames as unit
$02 Absolute time, 32 bit sized, using milliseconds as unit
Abolute time means that every stamp contains the time from the
beginning of the file.
4.9. Unsychronised lyrics/text transcription
This frame contains the lyrics of the song or a text transcription of
other vocal activities. The head includes an encoding descriptor and
a content descriptor. The body consists of the actual text. The
'Content descriptor' is a terminated string. If no descriptor is
entered, 'Content descriptor' is $00 (00) only. Newline characters
are allowed in the text. Maximum length for the descriptor is 64
bytes. There may be more than one lyrics/text frame in each tag, but
only one with the same language and content descriptor.
Unsynced lyrics/text "ULT"
Frame size $xx xx xx
Text encoding $xx
Language $xx xx xx
Content descriptor <textstring> $00 (00)
Lyrics/text <textstring>
4.10. Synchronised lyrics/text
This is another way of incorporating the words, said or sung lyrics,
in the audio file as text, this time, however, in sync with the audio.
It might also be used to describing events e.g. occurring on a stage
or on the screen in sync with the audio. The header includes a content
descriptor, represented with as terminated textstring. If no
descriptor is entered, 'Content descriptor' is $00 (00) only.
Synced lyrics/text "SLT"
Frame size $xx xx xx
Text encoding $xx
Language $xx xx xx
Time stamp format $xx
Content type $xx
Content descriptor <textstring> $00 (00)
Encoding: $00 ISO-8859-1 [ISO-8859-1] character set is used => $00
is sync identifier.
$01 Unicode [UNICODE] character set is used => $00 00 is
sync identifier.
Content type: $00 is other
$01 is lyrics
$02 is text transcription
$03 is movement/part name (e.g. "Adagio")
$04 is events (e.g. "Don Quijote enters the stage")
$05 is chord (e.g. "Bb F Fsus")
Time stamp format is:
$01 Absolute time, 32 bit sized, using MPEG [MPEG] frames as unit
$02 Absolute time, 32 bit sized, using milliseconds as unit
Abolute time means that every stamp contains the time from the
beginning of the file.
The text that follows the frame header differs from that of the
unsynchronised lyrics/text transcription in one major way. Each
syllable (or whatever size of text is considered to be convenient by
the encoder) is a null terminated string followed by a time stamp
denoting where in the sound file it belongs. Each sync thus has the
following structure:
Terminated text to be synced (typically a syllable)
Sync identifier (terminator to above string) $00 (00)
Time stamp $xx (xx ...)
The 'time stamp' is set to zero or the whole sync is omitted if
located directly at the beginning of the sound. All time stamps should
be sorted in chronological order. The sync can be considered as a
validator of the subsequent string.
Newline characters are allowed in all "SLT" frames and should be used
after every entry (name, event etc.) in a frame with the content type
$03 - $04.
A few considerations regarding whitespace characters: Whitespace
separating words should mark the beginning of a new word, thus
occurring in front of the first syllable of a new word. This is also
valid for new line characters. A syllable followed by a comma should
not be broken apart with a sync (both the syllable and the comma
should be before the sync).
An example: The "ULT" passage
"Strangers in the night" $0A "Exchanging glances"
would be "SLT" encoded as:
"Strang" $00 xx xx "ers" $00 xx xx " in" $00 xx xx " the" $00 xx xx
" night" $00 xx xx 0A "Ex" $00 xx xx "chang" $00 xx xx "ing" $00 xx
xx "glan" $00 xx xx "ces" $00 xx xx
There may be more than one "SLT" frame in each tag, but only one with
the same language and content descriptor.
4.11. Comments
This frame replaces the old 30-character comment field in ID3v1. It
consists of a frame head followed by encoding, language and content
descriptors and is ended with the actual comment as a text string.
Newline characters are allowed in the comment text string. There may
be more than one comment frame in each tag, but only one with the same
language and content descriptor.
Comment "COM"
Frame size $xx xx xx
Text encoding $xx
Language $xx xx xx
Short content description <textstring> $00 (00)
The actual text <textstring>
4.12. Relative volume adjustment
This is a more subjective function than the previous ones. It allows
the user to say how much he wants to increase/decrease the volume on
each channel while the file is played. The purpose is to be able to
align all files to a reference volume, so that you don't have to
change the volume constantly. This frame may also be used to balance
adjust the audio. If the volume peak levels are known then this could
be described with the 'Peak volume right' and 'Peak volume left'
field. If Peakvolume is not known these fields could be left zeroed
or completely omitted. There may only be one "RVA" frame in each
tag.
Relative volume adjustment "RVA"
Frame size $xx xx xx
Increment/decrement %000000xx
Bits used for volume descr. $xx
Relative volume change, right $xx xx (xx ...)
Relative volume change, left $xx xx (xx ...)
Peak volume right $xx xx (xx ...)
Peak volume left $xx xx (xx ...)
In the increment/decrement field bit 0 is used to indicate the right
channel and bit 1 is used to indicate the left channel. 1 is
increment and 0 is decrement.
The 'bits used for volume description' field is normally $10 (16 bits)
for MPEG 2 layer I, II and III [MPEG] and MPEG 2.5. This value may not
be $00. The volume is always represented with whole bytes, padded in
the beginning (highest bits) when 'bits used for volume description'
is not a multiple of eight.
4.13. Equalisation
This is another subjective, alignment frame. It allows the user to
predefine an equalisation curve within the audio file. There may only
be one "EQU" frame in each tag.
Equalisation "EQU"
Frame size $xx xx xx
Adjustment bits $xx
The 'adjustment bits' field defines the number of bits used for
representation of the adjustment. This is normally $10 (16 bits) for
MPEG 2 layer I, II and III [MPEG] and MPEG 2.5. This value may not be
$00.
This is followed by 2 bytes + ('adjustment bits' rounded up to the
nearest byte) for every equalisation band in the following format,
giving a frequency range of 0 - 32767Hz:
Increment/decrement %x (MSB of the Frequency)
Frequency (lower 15 bits)
Adjustment $xx (xx ...)
The increment/decrement bit is 1 for increment and 0 for decrement.
The equalisation bands should be ordered increasingly with reference
to frequency. All frequencies don't have to be declared. Adjustments
with the value $00 should be omitted. A frequency should only be
described once in the frame.
4.14. Reverb
Yet another subjective one. You may here adjust echoes of different
kinds. Reverb left/right is the delay between every bounce in ms.
Reverb bounces left/right is the number of bounces that should be
made. $FF equals an infinite number of bounces. Feedback is the amount
of volume that should be returned to the next echo bounce. $00 is 0%,
$FF is 100%. If this value were $7F, there would be 50% volume
reduction on the first bounce, yet 50% on the second and so on. Left
to left means the sound from the left bounce to be played in the left
speaker, while left to right means sound from the left bounce to be
played in the right speaker.
'Premix left to right' is the amount of left sound to be mixed in the
right before any reverb is applied, where $00 id 0% and $FF is 100%.
'Premix right to left' does the same thing, but right to left. Setting
both premix to $FF would result in a mono output (if the reverb is
applied symmetric). There may only be one "REV" frame in each tag.
Reverb settings "REV"
Frame size $00 00 0C
Reverb left (ms) $xx xx
Reverb right (ms) $xx xx
Reverb bounces, left $xx
Reverb bounces, right $xx
Reverb feedback, left to left $xx
Reverb feedback, left to right $xx
Reverb feedback, right to right $xx
Reverb feedback, right to left $xx
Premix left to right $xx
Premix right to left $xx
4.15. Attached picture
This frame contains a picture directly related to the audio file.
Image format is preferably "PNG" [PNG] or "JPG" [JFIF]. Description
is a short description of the picture, represented as a terminated
textstring. The description has a maximum length of 64 characters,
but may be empty. There may be several pictures attached to one file,
each in their individual "PIC" frame, but only one with the same
content descriptor. There may only be one picture with the picture
type declared as picture type $01 and $02 respectively. There is a
possibility to put only a link to the image file by using the 'image
format' "-->" and having a complete URL [URL] instead of picture data.
The use of linked files should however be used restrictively since
there is the risk of separation of files.
Attached picture "PIC"
Frame size $xx xx xx
Text encoding $xx
Image format $xx xx xx
Picture type $xx
Description <textstring> $00 (00)
Picture data <binary data>
Picture type: $00 Other
$01 32x32 pixels 'file icon' (PNG only)
$02 Other file icon
$03 Cover (front)
$04 Cover (back)
$05 Leaflet page
$06 Media (e.g. lable side of CD)
$07 Lead artist/lead performer/soloist
$08 Artist/performer
$09 Conductor
$0A Band/Orchestra
$0B Composer
$0C Lyricist/text writer
$0D Recording Location
$0E During recording
$0F During performance
$10 Movie/video screen capture
$11 A bright coloured fish
$12 Illustration
$13 Band/artist logotype
$14 Publisher/Studio logotype
4.16. General encapsulated object
In this frame any type of file can be encapsulated. After the header,
'Frame size' and 'Encoding' follows 'MIME type' [MIME] and 'Filename'
for the encapsulated object, both represented as terminated strings
encoded with ISO 8859-1 [ISO-8859-1]. The filename is case sensitive.
Then follows a content description as terminated string, encoded as
'Encoding'. The last thing in the frame is the actual object. The
first two strings may be omitted, leaving only their terminations.
MIME type is always an ISO-8859-1 text string. There may be more than
one "GEO" frame in each tag, but only one with the same content
descriptor.
General encapsulated object "GEO"
Frame size $xx xx xx
Text encoding $xx
MIME type <textstring> $00
Filename <textstring> $00 (00)
Content description <textstring> $00 (00)
Encapsulated object <binary data>
4.17. Play counter
This is simply a counter of the number of times a file has been
played. The value is increased by one every time the file begins to
play. There may only be one "CNT" frame in each tag. When the counter
reaches all one's, one byte is inserted in front of the counter thus
making the counter eight bits bigger. The counter must be at least
32-bits long to begin with.
Play counter "CNT"
Frame size $xx xx xx
Counter $xx xx xx xx (xx ...)
4.18. Popularimeter
The purpose of this frame is to specify how good an audio file is.
Many interesting applications could be found to this frame such as a
playlist that features better audiofiles more often than others or it
could be used to profile a persons taste and find other 'good' files
by comparing people's profiles. The frame is very simple. It contains
the email address to the user, one rating byte and a four byte play
counter, intended to be increased with one for every time the file is
played. The email is a terminated string. The rating is 1-255 where
1 is worst and 255 is best. 0 is unknown. If no personal counter is
wanted it may be omitted. When the counter reaches all one's, one
byte is inserted in front of the counter thus making the counter
eight bits bigger in the same away as the play counter ("CNT").
There may be more than one "POP" frame in each tag, but only one with
the same email address.
Popularimeter "POP"
Frame size $xx xx xx
Email to user <textstring> $00
Rating $xx
Counter $xx xx xx xx (xx ...)
4.19. Recommended buffer size
Sometimes the server from which a audio file is streamed is aware of
transmission or coding problems resulting in interruptions in the
audio stream. In these cases, the size of the buffer can be
recommended by the server using this frame. If the 'embedded info
flag' is true (1) then this indicates that an ID3 tag with the
maximum size described in 'Buffer size' may occur in the audiostream.
In such case the tag should reside between two MPEG [MPEG] frames, if
the audio is MPEG encoded. If the position of the next tag is known,
'offset to next tag' may be used. The offset is calculated from the
end of tag in which this frame resides to the first byte of the header
in the next. This field may be omitted. Embedded tags is currently not
recommended since this could render unpredictable behaviour from
present software/hardware. The 'Buffer size' should be kept to a
minimum. There may only be one "BUF" frame in each tag.
Recommended buffer size "BUF"
Frame size $xx xx xx
Buffer size $xx xx xx
Embedded info flag %0000000x
Offset to next tag $xx xx xx xx
4.20. Encrypted meta frame
This frame contains one or more encrypted frames. This enables
protection of copyrighted information such as pictures and text, that
people might want to pay extra for. Since standardisation of such an
encryption scheme is beyond this document, all "CRM" frames begin with
a terminated string with a URL [URL] containing an email address, or a
link to a location where an email adress can be found, that belongs to
the organisation responsible for this specific encrypted meta frame.
Questions regarding the encrypted frame should be sent to the
indicated email address. If a $00 is found directly after the 'Frame
size', the whole frame should be ignored, and preferably be removed.
The 'Owner identifier' is then followed by a short content description
and explanation as to why it's encrypted. After the
'content/explanation' description, the actual encrypted block follows.
When an ID3v2 decoder encounters a "CRM" frame, it should send the
datablock to the 'plugin' with the corresponding 'owner identifier'
and expect to receive either a datablock with one or several ID3v2
frames after each other or an error. There may be more than one "CRM"
frames in a tag, but only one with the same 'owner identifier'.
Encrypted meta frame "CRM"
Frame size $xx xx xx
Owner identifier <textstring> $00 (00)
Content/explanation <textstring> $00 (00)
Encrypted datablock <binary data>
4.21. Audio encryption
This frame indicates if the actual audio stream is encrypted, and by
whom. Since standardisation of such encrypion scheme is beyond this
document, all "CRA" frames begin with a terminated string with a
URL containing an email address, or a link to a location where an
email address can be found, that belongs to the organisation
responsible for this specific encrypted audio file. Questions
regarding the encrypted audio should be sent to the email address
specified. If a $00 is found directly after the 'Frame size' and the
audiofile indeed is encrypted, the whole file may be considered
useless.
After the 'Owner identifier', a pointer to an unencrypted part of the
audio can be specified. The 'Preview start' and 'Preview length' is
described in frames. If no part is unencrypted, these fields should be
left zeroed. After the 'preview length' field follows optionally a
datablock required for decryption of the audio. There may be more than
one "CRA" frames in a tag, but only one with the same 'Owner
identifier'.
Audio encryption "CRA"
Frame size $xx xx xx
Owner identifier <textstring> $00 (00)
Preview start $xx xx
Preview length $xx xx
Encryption info <binary data>
4.22. Linked information
To keep space waste as low as possible this frame may be used to link
information from another ID3v2 tag that might reside in another audio
file or alone in a binary file. It is recommended that this method is
only used when the files are stored on a CD-ROM or other circumstances
when the risk of file seperation is low. The frame contains a frame
identifier, which is the frame that should be linked into this tag, a
URL [URL] field, where a reference to the file where the frame is
given, and additional ID data, if needed. Data should be retrieved
from the first tag found in the file to which this link points. There
may be more than one "LNK" frame in a tag, but only one with the same
contents. A linked frame is to be considered as part of the tag and
has the same restrictions as if it was a physical part of the tag
(i.e. only one "REV" frame allowed, whether it's linked or not).
Linked information "LNK"
Frame size $xx xx xx
Frame identifier $xx xx xx
URL <textstring> $00 (00)
Additional ID data <textstring(s)>
Frames that may be linked and need no additional data are "IPL",
"MCI", "ETC", "LLT", "STC", "RVA", "EQU", "REV", "BUF", the text
information frames and the URL link frames.
The "TXX", "PIC", "GEO", "CRM" and "CRA" frames may be linked with the
content descriptor as additional ID data.
The "COM", "SLT" and "ULT" frames may be linked with three bytes of
language descriptor directly followed by a content descriptor as
additional ID data.
5. The 'unsynchronisation scheme'
The only purpose of the 'unsychronisation scheme' is to make the ID3v2
tag as compatible as possible with existing software. There is no use
in 'unsynchronising' tags if the file is only to be processed by new
software. Unsynchronisation may only be made with MPEG 2 layer I, II
and III and MPEG 2.5 files.
Whenever a false synchronisation is found within the tag, one zeroed
byte is inserted after the first false synchronisation byte. The
format of a correct sync that should be altered by ID3 encoders is as
follows:
%11111111 111xxxxx
And should be replaced with:
%11111111 00000000 111xxxxx
This has the side effect that all $FF 00 combinations have to be
altered, so they won't be affected by the decoding process. Therefore
all the $FF 00 combinations have to be replaced with the $FF 00 00
combination during the unsynchonisation.
To indicate usage of the unsynchronisation, the first bit in 'ID3
flags' should be set. This bit should only be set if the tag
contained a, now corrected, false synchronisation. The bit should
only be clear if the tag does not contain any false synchronisations.
Do bear in mind, that if a compression scheme is used by the encoder,
the unsyncronisation scheme should be applied *afterwards*. When
decoding a compressed, 'unsyncronised' file, the 'unsyncronisation
scheme' should be parsed first, compression afterwards.
6. Copyright
Copyright (C) Martin Nilsson 1998. All Rights Reserved.
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any
kind, provided that a reference to this document is included on all
such copies and derivative works. However, this document itself may
not be modified in any way and reissued as the original document.
The limited permissions granted above are perpetual and will not be
revoked.
This document and the information contained herein is provided on an
"AS IS" basis and THE AUTHORS DISCLAIMS ALL WARRANTIES, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
7. References
[CDDB] Compact Disc Data Base
<url:http://www.cddb.com>
[ISO-639-2] ISO/FDIS 639-2.
Codes for the representation of names of languages, Part 2: Alpha-3
code. Technical committee / subcommittee: TC 37 / SC 2
[ISO-8859-1] ISO/IEC DIS 8859-1.
8-bit single-byte coded graphic character sets, Part 1: Latin
alphabet No. 1. Technical committee / subcommittee: JTC 1 / SC 2
[ISRC] ISO 3901:1986
International Standard Recording Code (ISRC).
Technical committee / subcommittee: TC 46 / SC 9
[JFIF] JPEG File Interchange Format, version 1.02
<url:http://www.w3.org/Graphics/JPEG/jfif.txt>
[MIME] Freed, N. and N. Borenstein, "Multipurpose Internet Mail
Extensions (MIME) Part One: Format of Internet Message Bodies",
RFC 2045, November 1996.
<url:ftp://ftp.isi.edu/in-notes/rfc2045.txt>
[MPEG] ISO/IEC 11172-3:1993.
Coding of moving pictures and associated audio for digital storage
media at up to about 1,5 Mbit/s, Part 3: Audio.
Technical committee / subcommittee: JTC 1 / SC 29
and
ISO/IEC 13818-3:1995
Generic coding of moving pictures and associated audio information,
Part 3: Audio.
Technical committee / subcommittee: JTC 1 / SC 29
and
ISO/IEC DIS 13818-3
Generic coding of moving pictures and associated audio information,
Part 3: Audio (Revision of ISO/IEC 13818-3:1995)
[PNG] Portable Network Graphics, version 1.0
<url:http://www.w3.org/TR/REC-png-multi.html>
[UNICODE] ISO/IEC 10646-1:1993.
Universal Multiple-Octet Coded Character Set (UCS), Part 1:
Architecture and Basic Multilingual Plane. Technical committee
/ subcommittee: JTC 1 / SC 2
<url:http://www.unicode.org>
[URL] T. Berners-Lee, L. Masinter & M. McCahill, "Uniform Resource
Locators (URL).", RFC 1738, December 1994.
<url:ftp://ftp.isi.edu/in-notes/rfc1738.txt>
8. Appendix
A. Appendix A - ID3-Tag Specification V1.1
ID3-Tag Specification V1.1 (12 dec 1997) by Michael Mutschler
<amiga2@info2.rus.uni-stuttgart.de>, edited for space and clarity
reasons.
A.1. Overview
The ID3-Tag is an information field for MPEG Layer 3 audio files.
Since a standalone MP3 doesn't provide a method of storing other
information than those directly needed for replay reasons, the
ID3-tag was invented by Eric Kemp in 1996.
A revision from ID3v1 to ID3v1.1 was made by Michael Mutschler to
support track number information is described in A.4.
A.2. ID3v1 Implementation
The Information is stored in the last 128 bytes of an MP3. The Tag
has got the following fields, and the offsets given here, are from
0-127.
Field Length Offsets
Tag 3 0-2
Songname 30 3-32
Artist 30 33-62
Album 30 63-92
Year 4 93-96
Comment 30 97-126
Genre 1 127
The string-fields contain ASCII-data, coded in ISO-Latin 1 codepage.
Strings which are smaller than the field length are padded with zero-
bytes.
Tag: The tag is valid if this field contains the string "TAG". This
has to be uppercase!
Songname: This field contains the title of the MP3 (string as
above).
Artist: This field contains the artist of the MP3 (string as above).
Album: this field contains the album where the MP3 comes from
(string as above).
Year: this field contains the year when this song has originally
been released (string as above).
Comment: this field contains a comment for the MP3 (string as
above). Revision to this field has been made in ID3v1.1. See
A.4.
Genre: this byte contains the offset of a genre in a predefined
list the byte is treated as an unsigned byte. The offset is
starting from 0. See A.3.
A.3. Genre List
The following genres is defined in ID3v1
0.Blues
1.Classic Rock
2.Country
3.Dance
4.Disco
5.Funk
6.Grunge
7.Hip-Hop
8.Jazz
9.Metal
10.New Age
11.Oldies
12.Other
13.Pop
14.R&B
15.Rap
16.Reggae
17.Rock
18.Techno
19.Industrial
20.Alternative
21.Ska
22.Death Metal
23.Pranks
24.Soundtrack
25.Euro-Techno
26.Ambient
27.Trip-Hop
28.Vocal
29.Jazz+Funk
30.Fusion
31.Trance
32.Classical
33.Instrumental
34.Acid
35.House
36.Game
37.Sound Clip
38.Gospel
39.Noise
40.AlternRock
41.Bass
42.Soul
43.Punk
44.Space
45.Meditative
46.Instrumental Pop
47.Instrumental Rock
48.Ethnic
49.Gothic
50.Darkwave
51.Techno-Industrial
52.Electronic
53.Pop-Folk
54.Eurodance
55.Dream
56.Southern Rock
57.Comedy
58.Cult
59.Gangsta
60.Top 40
61.Christian Rap
62.Pop/Funk
63.Jungle
64.Native American
65.Cabaret
66.New Wave
67.Psychadelic
68.Rave
69.Showtunes
70.Trailer
71.Lo-Fi
72.Tribal
73.Acid Punk
74.Acid Jazz
75.Polka
76.Retro
77.Musical
78.Rock & Roll
79.Hard Rock
The following genres are Winamp extensions
80.Folk
81.Folk-Rock
82.National Folk
83.Swing
84.Fast Fusion
85.Bebob
86.Latin
87.Revival
88.Celtic
89.Bluegrass
90.Avantgarde
91.Gothic Rock
92.Progressive Rock
93.Psychedelic Rock
94.Symphonic Rock
95.Slow Rock
96.Big Band
97.Chorus
98.Easy Listening
99.Acoustic
100.Humour
101.Speech
102.Chanson
103.Opera
104.Chamber Music
105.Sonata
106.Symphony
107.Booty Bass
108.Primus
109.Porn Groove
110.Satire
111.Slow Jam
112.Club
113.Tango
114.Samba
115.Folklore
116.Ballad
117.Power Ballad
118.Rhythmic Soul
119.Freestyle
120.Duet
121.Punk Rock
122.Drum Solo
123.A capella
124.Euro-House
125.Dance Hall
A.4. Track addition - ID3v1.1
In ID3v1.1, Michael Mutschler revised the specification of the
comment field in order to implement the track number. The new format
of the comment field is a 28 character string followed by a mandatory
null ($00) character and the original album tracknumber stored as an
unsigned byte-size integer. In such cases where the 29th byte is not
the null character or when the 30th is a null character, the
tracknumber is to be considered undefined.
9. Author's Address
Martin Nilsson
Rydsv�gen 246 C. 30
S-584 34 Link�ping
Sweden
Email: nilsson at id3.org
Co-authors:
Johan Sundstr�m Email: johan at id3.org 
The Audience is informed