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Singleton tags, which should only appear once. If one of these tags
appears more than once, its last appearance should be displayed if there
is only room to display one instance of the tag.

ALBUM
    If appropriate, an album name, e.g., `Days Of Future Passed' or
    `Beethoven: Symphonies Nos. 1-9'.

*AKA
    An alternative title e.g., `Choral' for the Beethoven's ninth or
    `Njósnavélin' for the 4th song of the album `( )' by `Sigur Rós'.

ARTIST
    For information to be displayed on systems with limited display
    capabilities. It is not a replacement for the ENSEMBLE and PERFORMER
    tags, but typically will summarize them e.g., `The Beach Boys'. May
    not be appropriate for classical music (see ENSEMBLE and PERFORMER
    instead).

PUBLISHER
    Who publishes the disc the track came from.

*COMPILATION
    Should be set to 1 if the album is a compilation.

*COLLECTION
    If the album belongs to a particular collection, put its name there
    e.g., `Les incontournables du Jazz'.

COPYRIGHT
    Who holds copyright to the track or disc the track is on.

DISCNUMBER
    If part of a multi-disc album, put the disc number here. If the disc
    has a name, it should be set in VOLUME.
    You can use any format you like, such as Roman numerals, regular
    numbers, or whatever. The numbers such as Roman numerals, regular
    numbers, or whatever.  The numbers should be entered in such a way
    that an alphabetical sort on this tag will correctly show the proper
    ordering of all the oggs that contain the tag.

ISRC
    This number lets you order a CD over the phone from a record shop.

*EDITION
    If disc is a remastered / reissue edition, put it there e.g.
    `digitally remastered' or `limited'. Don't put any DATE information
    there.

EAN/UPN
    There may be a barcode on the CD; it is most likely an EAN or UPN
    (Universal Product Number).

*KEY
    The key signature of the track e.g., `E-flat major' or `D minor'. If
    changes inside, for example, a movement, the "local key" may be
    written inside the PART.

LABEL
    The record label or imprint on the disc e.g., `Mercury Records'.

LABELNO
    Record labels often put the catalog number of the source media
    somewhere on the packaging. Use this tag to record it.

LICENSE
    The license, or URL for the license the track is under. For
    instance, the Open Audio license.

*LIVE
    Should be set to 1 if the track is a live performance.

OPUS
    The number of the work; e.g., `10', `BWV 81' or `KV 6'. Sould
    finish by a number.

SOURCEMEDIA
    The recording media the track came from. e.g., `CD', `Cassette',
    `Radio Broadcast', `LP', `CD Single', `Bootleg', `Hybrid SACD' or
    `Enhanced CD'.

TITLE
    "The work", whether a symphony, or a pop song e.g., `Symphony No. 5'
    or `Lucy In The Sky With Diamonds'.

TRACKNUMBER
    The track number on the CD, e.g., `03'. Should be a number.

VERSION
    Make sure you don't put DATE or LOCATION information in this tag.
    `live', `acoustic', `radio edit', `12 inch remix' or `featuring Ray
    Charles' might be typical values of this tag.

*VOLUME
    If part of a multi-disc album, put the disc name here e.g.,
    `Original album' or `Bonus disc'.

ENCODED-BY
    The person who encoded the Ogg file. May include contact
    information such as email address and phone number.

ENCODING
    Put the settings you used to encode the Ogg file here. This tag is
    NOT expected to be stored or returned by CDDB type databases. It
    includes information about the quality setting, bit rate, and
    bitrate management settings used to encode the Ogg.  It also is
    used for information about which encoding software was used to do
    the encoding.

CDDB



The remaining tags are multiples; if they are present more than once,
all their occurances are considered significant.

COMPOSER
    Composer of the work e.g., `Gustav Mahler' or `Jimi Hendrix'.

ARRANGER
    The person who arranged the piece e.g., `Joseph Maurice Ravel'. Can
    be set to `traditional' if appropriate.

LYRICIST
    The person who wrote the lyrics if differs to the composer e.g.,
    `Gaetano Donizetti'.

AUTHOR
    For text that is spoken, or was originally meant to be spoken, the
    author e.g., `John Ronald Reuel Tolkien'.

CONDUCTOR
    Conductor of the work; e.g., `Herbert von Karajan'. Choir directors
    would also use this tag.

PERFORMER
    Individual performers singled out for mention with their instrument
    e.g., `Yoyo Ma (cello)' or `David Gilmour (electric & acoustic
    guitars, vocals)'.

ENSEMBLE
    The group performing the piece, when different from ARTIST. For
    example, this would be the orchestra in classical works e.g.,
    `London Symphony Orchestra'.    

PART
    A division within a work; e.g., a movement of a symphony. Some
    tracks contain several parts. Use a single PART tag for each part
    contained in a track. e.g., `movement 2. Andante in F major' or
    `a. Your Move'. Datas should be entered in such a way that an
    alphabetical sort on this tag will correctly show the proper ordering
    of the parts.

*PARTNUMBER
    If the part has no name but but only an index, it can be put here.
    Can be a range has well e.g., `1-9', and you can use any format you
    like, such as Roman numerals, regular numbers, or whatever.
    The numbers should be entered in such a way that an alphabetical sort
    on this tag will correctly show the proper ordering of all the oggs
    that contain the contain the piece of music.

GENRE
    Like the genre tag from the CDDB but without the limitations. You
    can put any genre you want in this tag. If you think "Pink Floyd"
    are a genre unto themselves, say so here. For crossover works, or
    ambiguous works, use as many GENRE tags as you think it takes to
    describe the styles used.

*DATE
    Date or date-time of relevance to the track. The date must be in
    ISO 8601 format, but may be followed by a space character, then any
    text you wish, including the same date in any other format. If there
    is no detail e.g., `1968', it should be the the date of the original
    release of the album.
    Examples:
    DATE=2002-11-04/03-08-24 recorded
    DATE=1969-11-27/28 recorded
    DATE=1791-09-30 premièred
    DATE=1811/12 composed
    DATE=2003 reissued
    DATE=1967 released

LOCATION
    Location of recording e.g., `Madison Square Garden, New York City, NY'.

COMMENT
    Additional comments of any nature e.g., `Bonus track'.



The fields related to album information i.e., ALBUM, EDITION, PUBLISHER,
ISRC, EAN/UPN, LABEL, LABELNO, SOURCEMEDIA, should be the same for every
track in an album.



References:
  [1] Ogg Vorbis Documentation
http://www.xiph.org/vorbis/doc/v-comment.html
  [2] VorbisComment http://wiki.xiph.org/index.php/VorbisComment
  [3] Ogg Vorbis Comment Field Recommendations
http://age.hobba.nl/audio/mirroredpages/ogg-tagging.html