Appendix B: Tag Mapping

The following is a mapping between Picard internal tag names and those used by various tagging formats. The mapping is also available as a table and a spreadsheet.

AcoustID

Internal Name	`acoustid_id`
ID3v2	`TXXX:Acoustid Id`
Vorbis	`ACOUSTID_ID`
APEv2	`ACOUSTID_ID`
iTunes MP4	`----:com.apple.iTunes:Acoustid Id`
ASF/Windows Media	`Acoustid/Id`
RIFF INFO	n/a

AcoustID Fingerprint

Internal Name	`acoustid_fingerprint`
ID3v2	`TXXX:Acoustid Fingerprint`
Vorbis	`ACOUSTID_FINGERPRINT`
APEv2	`ACOUSTID_FINGERPRINT`
iTunes MP4	`----:com.apple.iTunes:Acoustid Fingerprint`
ASF/Windows Media	`Acoustid/Fingerprint`
RIFF INFO	n/a

Album 

Internal Name	`album`
ID3v2	`TALB`
Vorbis	`ALBUM`
APEv2	`Album`
iTunes MP4	`©alb`
ASF/Windows Media	`WM/AlbumTitle`
RIFF INFO	`IPRD`

Album Artist 

Internal Name	`albumartist`
ID3v2	`TPE2`
Vorbis	`ALBUMARTIST`
APEv2	`Album Artist`
iTunes MP4	`aART`
ASF/Windows Media	`WM/AlbumArtist`
RIFF INFO	n/a

Album Artist Sort Order

Internal Name	`albumartistsort`
ID3v2	`TSO2` (Picard>=1.2) `TXXX:ALBUMARTISTSORT` (Picard<=1.1)
Vorbis	`ALBUMARTISTSORT`
APEv2	`ALBUMARTISTSORT`
iTunes MP4	`soaa`
ASF/Windows Media	`WM/AlbumArtistSortOrder`
RIFF INFO	n/a

Album Sort Order ^[4]

Internal Name	`albumsort`
ID3v2	`TSOA`
Vorbis	`ALBUMSORT`
APEv2	`ALBUMSORT`
iTunes MP4	`soal`
ASF/Windows Media	`WM/AlbumSortOrder`
RIFF INFO	n/a

Arranger 

Internal Name	`arranger`
ID3v2	`TIPL:arranger` (ID3v2.4) `IPLS:arranger` (ID3v2.3)
Vorbis	`ARRANGER`
APEv2	`Arranger`
iTunes MP4	n/a
ASF/Windows Media	n/a
RIFF INFO	n/a

Artist 

Internal Name	`artist`
ID3v2	`TPE1`
Vorbis	`ARTIST`
APEv2	`Artist`
iTunes MP4	`©ART`
ASF/Windows Media	`Author`
RIFF INFO	`IART`

Artist Sort Order

Internal Name	`artistsort`
ID3v2	`TSOP`
Vorbis	`ARTISTSORT`
APEv2	`ARTISTSORT`
iTunes MP4	`soar`
ASF/Windows Media	`WM/ArtistSortOrder`
RIFF INFO	n/a

Artists

Internal Name	`artists`
ID3v2	`TXXX:ARTISTS`
Vorbis	`ARTISTS`
APEv2	`Artists`
iTunes MP4	`----:com.apple.iTunes:ARTISTS`
ASF/Windows Media	`WM/ARTISTS`
RIFF INFO	n/a

ASIN 

Internal Name	`asin`
ID3v2	`TXXX:ASIN`
Vorbis	`ASIN`
APEv2	`ASIN`
iTunes MP4	`----:com.apple.iTunes:ASIN`
ASF/Windows Media	`ASIN`
RIFF INFO	n/a

Barcode 

Internal Name	`barcode`
ID3v2	`TXXX:BARCODE`
Vorbis	`BARCODE`
APEv2	`Barcode`
iTunes MP4	`----:com.apple.iTunes:BARCODE`
ASF/Windows Media	`WM/Barcode`
RIFF INFO	n/a

BPM ^[4]

Internal Name	`bpm`
ID3v2	`TBPM`
Vorbis	`BPM`
APEv2	`BPM`
iTunes MP4	`tmpo`
ASF/Windows Media	`WM/BeatsPerMinute`
RIFF INFO	n/a

Catalog Number 

Internal Name	`catalognumber`
ID3v2	`TXXX:CATALOGNUMBER`
Vorbis	`CATALOGNUMBER`
APEv2	`CatalogNumber`
iTunes MP4	`----:com.apple.iTunes:CATALOGNUMBER`
ASF/Windows Media	`WM/CatalogNo`
RIFF INFO	n/a

Comment ^[4]

Internal Name	`comment:description`
ID3v2	`COMM:description`
Vorbis	`COMMENT`
APEv2	`Comment`
iTunes MP4	`©cmt`
ASF/Windows Media	`Description`
RIFF INFO	`ICMT`

Compilation (iTunes) ^[5]

Internal Name	`compilation`
ID3v2	`TCMP`
Vorbis	`COMPILATION`
APEv2	`Compilation`
iTunes MP4	`cpil`
ASF/Windows Media	`WM/IsCompilation`
RIFF INFO	n/a

Composer 

Internal Name	`composer`
ID3v2	`TCOM`
Vorbis	`COMPOSER`
APEv2	`Composer`
iTunes MP4	`©wrt`
ASF/Windows Media	`WM/Composer`
RIFF INFO	`IMUS`

Composer Sort Order

Internal Name	`composersort`
ID3v2	`TSOC` (Picard>=1.3) `TXXX:COMPOSERSORT` (Picard<=1.2)
Vorbis	`COMPOSERSORT`
APEv2	`COMPOSERSORT`
iTunes MP4	`soco`
ASF/Windows Media	`WM/ComposerSortOrder` (Picard>=1.3)
RIFF INFO	n/a

Conductor 

Internal Name	`conductor`
ID3v2	`TPE3`
Vorbis	`CONDUCTOR`
APEv2	`Conductor`
iTunes MP4	`----:com.apple.iTunes:CONDUCTOR`
ASF/Windows Media	`WM/Conductor`
RIFF INFO	n/a

Copyright ^[4]

Internal Name	`copyright`
ID3v2	`TCOP`
Vorbis	`COPYRIGHT`
APEv2	`Copyright`
iTunes MP4	`cprt`
ASF/Windows Media	`Copyright`
RIFF INFO	`ICOP`

Date ^[10]

Internal Name	`date`
ID3v2	`TDRC` (ID3v2.4) `TYER` + `TDAT` (ID3v2.3)
Vorbis	`DATE`
APEv2	`Year`
iTunes MP4	`©day`
ASF/Windows Media	`WM/Year`
RIFF INFO	`ICRD`

Director

Internal Name	`director`
ID3v2	`TXXX:DIRECTOR`
Vorbis	`DIRECTOR`
APEv2	`Director`
iTunes MP4	`©dir` ^[9]
ASF/Windows Media	`WM/Director`
RIFF INFO	n/a

Disc Number

Internal Name	`discnumber`
ID3v2	`TPOS`
Vorbis	`DISCNUMBER`
APEv2	`Disc`
iTunes MP4	`disk`
ASF/Windows Media	`WM/PartOfSet`
RIFF INFO	n/a

Disc Subtitle

Internal Name	`discsubtitle`
ID3v2	`TSST` (ID3v2.4 only)
Vorbis	`DISCSUBTITLE`
APEv2	`DiscSubtitle`
iTunes MP4	`----:com.apple.iTunes:DISCSUBTITLE`
ASF/Windows Media	`WM/SetSubTitle`
RIFF INFO	n/a

Encoded By ^[4]

Internal Name	`encodedby`
ID3v2	`TENC`
Vorbis	`ENCODEDBY`
APEv2	`EncodedBy`
iTunes MP4	`©too`
ASF/Windows Media	`WM/EncodedBy`
RIFF INFO	`IENC`

Encoder Settings ^[4]

Internal Name	`encodersettings`
ID3v2	`TSSE`
Vorbis	`ENCODERSETTINGS`
APEv2	`EncoderSettings`
iTunes MP4	n/a
ASF/Windows Media	`WM/EncodingSettings` (Picard>=1.3.1)
RIFF INFO	n/a

Engineer 

Internal Name	`engineer`
ID3v2	`TIPL:engineer` (ID3v2.4) `IPLS:engineer` (ID3v2.3)
Vorbis	`ENGINEER`
APEv2	`Engineer`
iTunes MP4	`----:com.apple.iTunes:ENGINEER`
ASF/Windows Media	`WM/Engineer`
RIFF INFO	`IENG`

Gapless Playback ^[4]

Internal Name	`gapless`
ID3v2	n/a
Vorbis	n/a
APEv2	n/a
iTunes MP4	`pgap`
ASF/Windows Media	n/a
RIFF INFO	n/a

Genre 

Internal Name	`genre`
ID3v2	`TCON`
Vorbis	`GENRE`
APEv2	`Genre`
iTunes MP4	`©gen`
ASF/Windows Media	`WM/Genre`
RIFF INFO	`IGNR`

Grouping ^[3]

Internal Name	`grouping`
ID3v2	`TIT1` `GRP1` ^[8]
Vorbis	`GROUPING`
APEv2	`Grouping`
iTunes MP4	`©grp`
ASF/Windows Media	`WM/ContentGroupDescription`
RIFF INFO	n/a

Initial Key

Internal Name	`key` (Picard>=1.4)
ID3v2	`TKEY`
Vorbis	`KEY`
APEv2	`KEY`
iTunes MP4	`----:com.apple.iTunes:initialkey`
ASF/Windows Media	`WM/InitialKey`
RIFF INFO	n/a

ISRC 

Internal Name	`isrc`
ID3v2	`TSRC`
Vorbis	`ISRC`
APEv2	`ISRC`
iTunes MP4	`----:com.apple.iTunes:ISRC`
ASF/Windows Media	`WM/ISRC`
RIFF INFO	n/a

Language

Internal Name	`language`
ID3v2	`TLAN`
Vorbis	`LANGUAGE`
APEv2	`Language`
iTunes MP4	`----:com.apple.iTunes:LANGUAGE`
ASF/Windows Media	`WM/Language`
RIFF INFO	`ILNG`

License ^{[6, 7]}

Internal Name	`license`
ID3v2	`WCOP` (single URL) `TXXX:LICENSE` (multiple or non-URL)
Vorbis	`LICENSE`
APEv2	`LICENSE`
iTunes MP4	`----:com.apple.iTunes:LICENSE`
ASF/Windows Media	n/a
RIFF INFO	n/a

Lyricist 

Internal Name	`lyricist`
ID3v2	`TEXT`
Vorbis	`LYRICIST`
APEv2	`Lyricist`
iTunes MP4	`----:com.apple.iTunes:LYRICIST`
ASF/Windows Media	`WM/Writer`
RIFF INFO	n/a

Lyrics ^[4]

Internal Name	`lyrics:description`
ID3v2	`USLT:description`
Vorbis	`LYRICS`
APEv2	`Lyrics`
iTunes MP4	`©lyr`
ASF/Windows Media	`WM/Lyrics`
RIFF INFO	n/a

Media 

Internal Name	`media`
ID3v2	`TMED`
Vorbis	`MEDIA`
APEv2	`Media`
iTunes MP4	`----:com.apple.iTunes:MEDIA`
ASF/Windows Media	`WM/Media`
RIFF INFO	`IMED`

Mix-DJ 

Internal Name	`djmixer`
ID3v2	`TIPL:DJ-mix` (ID3v2.4) `IPLS:DJ-mix` (ID3v2.3)
Vorbis	`DJMIXER`
APEv2	`DJMixer`
iTunes MP4	`----:com.apple.iTunes:DJMIXER`
ASF/Windows Media	`WM/DJMixer`
RIFF INFO	n/a

Mixer 

Internal Name	`mixer`
ID3v2	`TIPL:mix` (ID3v2.4) `IPLS:mix` (ID3v2.3)
Vorbis	`MIXER`
APEv2	`Mixer`
iTunes MP4	`----:com.apple.iTunes:MIXER`
ASF/Windows Media	`WM/Mixer`
RIFF INFO	n/a

Mood ^[3]

Internal Name	`mood`
ID3v2	`TMOO` (ID3v2.4 only)
Vorbis	`MOOD`
APEv2	`Mood`
iTunes MP4	`----:com.apple.iTunes:MOOD`
ASF/Windows Media	`WM/Mood`
RIFF INFO	n/a

Movement ^[4]

Internal Name	`movement` (Picard>=2.1)
ID3v2	`MVNM`
Vorbis	`MOVEMENTNAME`
APEv2	`MOVEMENTNAME`
iTunes MP4	`©mvn`
ASF/Windows Media	n/a
RIFF INFO	n/a

Movement Count ^[4]

Internal Name	`movementtotal` (Picard>=2.1)
ID3v2	`MVIN`
Vorbis	`MOVEMENTTOTAL`
APEv2	`MOVEMENTTOTAL`
iTunes MP4	`mvc`
ASF/Windows Media	n/a
RIFF INFO	n/a

Movement Number ^[4]

Internal Name	`movementnumber` (Picard>=2.1)
ID3v2	`MVIN`
Vorbis	`MOVEMENT`
APEv2	`MOVEMENT`
iTunes MP4	`mvi`
ASF/Windows Media	n/a
RIFF INFO	n/a

MusicBrainz Artist ID 

Internal Name	`musicbrainz_artistid`
ID3v2	`TXXX:MusicBrainz Artist Id`
Vorbis	`MUSICBRAINZ_ARTISTID`
APEv2	`MUSICBRAINZ_ARTISTID`
iTunes MP4	`----:com.apple.iTunes:MusicBrainz Artist Id`
ASF/Windows Media	`MusicBrainz/Artist Id`
RIFF INFO	n/a

MusicBrainz Disc ID 

Internal Name	`musicbrainz_discid`
ID3v2	`TXXX:MusicBrainz Disc Id`
Vorbis	`MUSICBRAINZ_DISCID`
APEv2	`MUSICBRAINZ_DISCID`
iTunes MP4	`----:com.apple.iTunes:MusicBrainz Disc Id`
ASF/Windows Media	`MusicBrainz/Disc Id`
RIFF INFO	n/a

MusicBrainz Original Artist ID 

Internal Name	`musicbrainz_originalartistid`
ID3v2	`TXXX:MusicBrainz Original Artist Id`
Vorbis	`MUSICBRAINZ_ORIGINALARTISTID`
APEv2	n/a
iTunes MP4	`----:com.apple.iTunes:MusicBrainz Original Artist Id` (Picard>=2.1)
ASF/Windows Media	`MusicBrainz/Original Artist Id` (Picard>=2.1)
RIFF INFO	n/a

MusicBrainz Original Release ID 

Internal Name	`musicbrainz_originalalbumid`
ID3v2	`TXXX:MusicBrainz Original Album Id`
Vorbis	`MUSICBRAINZ_ORIGINALALBUMID`
APEv2	n/a
iTunes MP4	`----:com.apple.iTunes:MusicBrainz Original Album Id` (Picard>=2.1)
ASF/Windows Media	`MusicBrainz/Original Album Id` (Picard>=2.1)
RIFF INFO	n/a

MusicBrainz Recording ID 

Internal Name	`musicbrainz_recordingid`
ID3v2	`UFID:http://musicbrainz.org`
Vorbis	`MUSICBRAINZ_TRACKID`
APEv2	`MUSICBRAINZ_TRACKID`
iTunes MP4	`----:com.apple.iTunes:MusicBrainz Track Id`
ASF/Windows Media	`MusicBrainz/Track Id`
RIFF INFO	n/a

MusicBrainz Release Artist ID 

Internal Name	`musicbrainz_albumartistid`
ID3v2	`TXXX:MusicBrainz Album Artist Id`
Vorbis	`MUSICBRAINZ_ALBUMARTISTID`
APEv2	`MUSICBRAINZ_ALBUMARTISTID`
iTunes MP4	`----:com.apple.iTunes:MusicBrainz Album Artist Id`
ASF/Windows Media	`MusicBrainz/Album Artist Id`
RIFF INFO	n/a

MusicBrainz Release Group ID

Internal Name	`musicbrainz_releasegroupid`
ID3v2	`TXXX:MusicBrainz Release Group Id`
Vorbis	`MUSICBRAINZ_RELEASEGROUPID`
APEv2	`MUSICBRAINZ_RELEASEGROUPID`
iTunes MP4	`----:com.apple.iTunes:MusicBrainz Release Group Id`
ASF/Windows Media	`MusicBrainz/Release Group Id`
RIFF INFO	n/a

MusicBrainz Release ID 

Internal Name	`musicbrainz_albumid`
ID3v2	`TXXX:MusicBrainz Album Id`
Vorbis	`MUSICBRAINZ_ALBUMID`
APEv2	`MUSICBRAINZ_ALBUMID`
iTunes MP4	`----:com.apple.iTunes:MusicBrainz Album Id`
ASF/Windows Media	`MusicBrainz/Album Id`
RIFF INFO	n/a

MusicBrainz Track ID 

Internal Name	`musicbrainz_trackid`
ID3v2	`TXXX:MusicBrainz Release Track Id`
Vorbis	`MUSICBRAINZ_RELEASETRACKID`
APEv2	`MUSICBRAINZ_RELEASETRACKID`
iTunes MP4	`----:com.apple.iTunes:MusicBrainz Release Track Id`
ASF/Windows Media	`MusicBrainz/Release Track Id`
RIFF INFO	n/a

MusicBrainz TRM ID 

Internal Name	`musicbrainz_trmid` (deprecated)
ID3v2	`TXXX:MusicBrainz TRM Id`
Vorbis	`MUSICBRAINZ_TRMID`
APEv2	`MUSICBRAINZ_TRMID`
iTunes MP4	`----:com.apple.iTunes:MusicBrainz TRM Id`
ASF/Windows Media	`MusicBrainz/TRM Id`
RIFF INFO	n/a

MusicBrainz Work ID

Internal Name	`musicbrainz_workid`
ID3v2	`TXXX:MusicBrainz Work Id`
Vorbis	`MUSICBRAINZ_WORKID`
APEv2	`MUSICBRAINZ_WORKID`
iTunes MP4	`----:com.apple.iTunes:MusicBrainz Work Id`
ASF/Windows Media	`MusicBrainz/Work Id`
RIFF INFO	n/a

MusicIP Fingerprint

Internal Name	`musicip_fingerprint`
ID3v2	`TXXX:MusicMagic Fingerprint`
Vorbis	`FINGERPRINT=MusicMagic Fingerprint {fingerprint}`
APEv2	n/a
iTunes MP4	`----:com.apple.iTunes:fingerprint`
ASF/Windows Media	n/a
RIFF INFO	n/a

MusicIP PUID 

Internal Name	`musicip_puid`
ID3v2	`TXXX:MusicIP PUID`
Vorbis	`MUSICIP_PUID`
APEv2	`MUSICIP_PUID`
iTunes MP4	`----:com.apple.iTunes:MusicIP PUID`
ASF/Windows Media	`MusicIP/PUID`
RIFF INFO	n/a

Original Album

Internal Name	`originalalbum`
ID3v2	`TOAL`
Vorbis	n/a
APEv2	n/a
iTunes MP4	n/a
ASF/Windows Media	`WM/OriginalAlbumTitle` (Picard>=2.1)
RIFF INFO	n/a

Original Artist

Internal Name	`originalartist`
ID3v2	`TOPE`
Vorbis	n/a
APEv2	`Original Artist` (Picard>=2.1)
iTunes MP4	n/a
ASF/Windows Media	`WM/OriginalArtist` (Picard>=2.1)
RIFF INFO	n/a

Original Filename

Internal Name	`originalfilename` (Picard>=2.3)
ID3v2	`TOFN`
Vorbis	`ORIGINALFILENAME`
APEv2	`ORIGINALFILENAME`
iTunes MP4	n/a
ASF/Windows Media	`WM/OriginalFilename`
RIFF INFO	n/a

Original Release Date ^[1]

Internal Name	`originaldate`
ID3v2	`TDOR` (ID3v2.4) `TORY` (ID3v2.3)
Vorbis	`ORIGINALDATE`
APEv2	n/a
iTunes MP4	n/a
ASF/Windows Media	`WM/OriginalReleaseTime` (Picard>=1.3.1) `WM/OriginalReleaseYear` (Picard<=1.3.0)
RIFF INFO	n/a

Original Release Year ^[1]

Internal Name	`originalyear`
ID3v2	n/a
Vorbis	`ORIGINALYEAR`
APEv2	`ORIGINALYEAR`
iTunes MP4	n/a
ASF/Windows Media	`WM/OriginalReleaseYear` (Picard>=1.3.1)
RIFF INFO	n/a

Performer

Internal Name	`performer:instrument`
ID3v2	`TMCL:instrument` (ID3v2.4) `IPLS:instrument` (ID3v2.3)
Vorbis	`PERFORMER={artist} (instrument)`
APEv2	`Performer={artist} (instrument)`
iTunes MP4	n/a
ASF/Windows Media	n/a
RIFF INFO	n/a

Podcast ^[4]

Internal Name	`podcast`
ID3v2	n/a
Vorbis	n/a
APEv2	n/a
iTunes MP4	`pcst`
ASF/Windows Media	n/a
RIFF INFO	n/a

Podcast URL ^[4]

Internal Name	`podcasturl`
ID3v2	n/a
Vorbis	n/a
APEv2	n/a
iTunes MP4	`purl`
ASF/Windows Media	n/a
RIFF INFO	n/a

Producer 

Internal Name	`producer`
ID3v2	`TIPL:producer` (ID3v2.4) `IPLS:producer` (ID3v2.3)
Vorbis	`PRODUCER`
APEv2	`Producer`
iTunes MP4	`----:com.apple.iTunes:PRODUCER`
ASF/Windows Media	`WM/Producer`
RIFF INFO	`IPRO`

Rating 

Internal Name	`_rating`
ID3v2	`POPM`
Vorbis	`RATING:user@email`
APEv2	n/a
iTunes MP4	n/a
ASF/Windows Media	`WM/SharedUserRating`
RIFF INFO	n/a

Record Label 

Internal Name	`label`
ID3v2	`TPUB`
Vorbis	`LABEL`
APEv2	`Label`
iTunes MP4	`----:com.apple.iTunes:LABEL`
ASF/Windows Media	`WM/Publisher`
RIFF INFO	n/a

Release Country 

Internal Name	`releasecountry`
ID3v2	`TXXX:MusicBrainz Album Release Country`
Vorbis	`RELEASECOUNTRY`
APEv2	`RELEASECOUNTRY`
iTunes MP4	`----:com.apple.iTunes:MusicBrainz Album Release Country`
ASF/Windows Media	`MusicBrainz/Album Release Country`
RIFF INFO	`ICNT`

Release Date ^[10]

Internal Name	`releasedate` (since Picard 2.9, not filled by default)
ID3v2	`TDRL` (ID3v2.4) `TXXX:RELEASEDATE` (ID3v2.3)
Vorbis	`RELEASEDATE`
APEv2	`RELEASEDATE`
iTunes MP4	`----:com.apple.iTunes:RELEASEDATE`
ASF/Windows Media	n/a
RIFF INFO	n/a

Release Status 

Internal Name	`releasestatus`
ID3v2	`TXXX:MusicBrainz Album Status`
Vorbis	`RELEASESTATUS`
APEv2	`MUSICBRAINZ_ALBUMSTATUS`
iTunes MP4	`----:com.apple.iTunes:MusicBrainz Album Status`
ASF/Windows Media	`MusicBrainz/Album Status`
RIFF INFO	n/a

Release Type 

Internal Name	`releasetype`
ID3v2	`TXXX:MusicBrainz Album Type`
Vorbis	`RELEASETYPE`
APEv2	`MUSICBRAINZ_ALBUMTYPE`
iTunes MP4	`----:com.apple.iTunes:MusicBrainz Album Type`
ASF/Windows Media	`MusicBrainz/Album Type`
RIFF INFO	n/a

Remixer 

Internal Name	`remixer`
ID3v2	`TPE4`
Vorbis	`REMIXER`
APEv2	`MixArtist`
iTunes MP4	`----:com.apple.iTunes:REMIXER`
ASF/Windows Media	`WM/ModifiedBy`
RIFF INFO	n/a

ReplayGain Album Gain

Internal Name	`replaygain_album_gain` (Picard>=2.2)
ID3v2	`TXXX:REPLAYGAIN_ALBUM_GAIN`
Vorbis	`REPLAYGAIN_ALBUM_GAIN`
APEv2	`REPLAYGAIN_ALBUM_GAIN`
iTunes MP4	`----:com.apple.iTunes:REPLAYGAIN_ALBUM_GAIN`
ASF/Windows Media	`REPLAYGAIN_ALBUM_GAIN`
RIFF INFO	n/a

ReplayGain Album Peak

Internal Name	`replaygain_album_peak` (Picard>=2.2)
ID3v2	`TXXX:REPLAYGAIN_ALBUM_PEAK`
Vorbis	`REPLAYGAIN_ALBUM_PEAK`
APEv2	`REPLAYGAIN_ALBUM_PEAK`
iTunes MP4	`----:com.apple.iTunes:REPLAYGAIN_ALBUM_PEAK`
ASF/Windows Media	`REPLAYGAIN_ALBUM_PEAK`
RIFF INFO	n/a

ReplayGain Album Range

Internal Name	`replaygain_album_range` (Picard>=2.2)
ID3v2	`TXXX:REPLAYGAIN_ALBUM_RANGE`
Vorbis	`REPLAYGAIN_ALBUM_RANGE`
APEv2	`REPLAYGAIN_ALBUM_RANGE`
iTunes MP4	`----:com.apple.iTunes:REPLAYGAIN_ALBUM_RANGE`
ASF/Windows Media	`REPLAYGAIN_ALBUM_RANGE`
RIFF INFO	n/a

ReplayGain Reference Loudness

Internal Name	`replaygain_reference_loudness` (Picard>=2.2)
ID3v2	`TXXX:REPLAYGAIN_REFERENCE_LOUDNESS`
Vorbis	`REPLAYGAIN_REFERENCE_LOUDNESS`
APEv2	`REPLAYGAIN_REFERENCE_LOUDNESS`
iTunes MP4	`----:com.apple.iTunes:REPLAYGAIN_REFERENCE_LOUDNESS`
ASF/Windows Media	`REPLAYGAIN_REFERENCE_LOUDNESS`
RIFF INFO	n/a

ReplayGain Track Gain

Internal Name	`replaygain_track_gain` (Picard>=2.2)
ID3v2	`TXXX:REPLAYGAIN_TRACK_GAIN`
Vorbis	`REPLAYGAIN_TRACK_GAIN`
APEv2	`REPLAYGAIN_TRACK_GAIN`
iTunes MP4	`----:com.apple.iTunes:REPLAYGAIN_TRACK_GAIN`
ASF/Windows Media	`REPLAYGAIN_TRACK_GAIN`
RIFF INFO	n/a

ReplayGain Track Peak

Internal Name	`replaygain_track_peak` (Picard>=2.2)
ID3v2	`TXXX:REPLAYGAIN_TRACK_PEAK`
Vorbis	`REPLAYGAIN_TRACK_PEAK`
APEv2	`REPLAYGAIN_TRACK_PEAK`
iTunes MP4	`----:com.apple.iTunes:REPLAYGAIN_TRACK_PEAK`
ASF/Windows Media	`REPLAYGAIN_TRACK_PEAK`
RIFF INFO	n/a

ReplayGain Track Range

Internal Name	`replaygain_track_range` (Picard>=2.2)
ID3v2	`TXXX:REPLAYGAIN_TRACK_RANGE`
Vorbis	`REPLAYGAIN_TRACK_RANGE`
APEv2	`REPLAYGAIN_TRACK_RANGE`
iTunes MP4	`----:com.apple.iTunes:REPLAYGAIN_TRACK_RANGE`
ASF/Windows Media	`REPLAYGAIN_TRACK_RANGE`
RIFF INFO	n/a

Script

Internal Name	`script`
ID3v2	`TXXX:SCRIPT`
Vorbis	`SCRIPT`
APEv2	`Script`
iTunes MP4	`----:com.apple.iTunes:SCRIPT`
ASF/Windows Media	`WM/Script`
RIFF INFO	n/a

Show Name ^[4]

Internal Name	`show`
ID3v2	n/a
Vorbis	n/a
APEv2	n/a
iTunes MP4	`tvsh`
ASF/Windows Media	n/a
RIFF INFO	n/a

Show Name Sort Order ^[4]

Internal Name	`showsort`
ID3v2	n/a
Vorbis	n/a
APEv2	n/a
iTunes MP4	`sosn`
ASF/Windows Media	n/a
RIFF INFO	n/a

Show Work & Movement ^[4]

Internal Name	`showmovement` (Picard>=2.1)
ID3v2	`TXXX:SHOWMOVEMENT`
Vorbis	`SHOWMOVEMENT`
APEv2	`SHOWMOVEMENT`
iTunes MP4	`shwm`
ASF/Windows Media	n/a
RIFF INFO	n/a

Subtitle ^[4]

Internal Name	`subtitle`
ID3v2	`TIT3`
Vorbis	`SUBTITLE`
APEv2	`Subtitle`
iTunes MP4	`----:com.apple.iTunes:SUBTITLE`
ASF/Windows Media	`WM/SubTitle`
RIFF INFO	n/a

Total Discs

Internal Name	`totaldiscs`
ID3v2	`TPOS`
Vorbis	`DISCTOTAL` and `TOTALDISCS`
APEv2	`Disc`
iTunes MP4	`disk`
ASF/Windows Media	`WM/PartOfSet` (Picard>=1.3.1)
RIFF INFO	n/a

Total Tracks

Internal Name	`totaltracks`
ID3v2	`TRCK`
Vorbis	`TRACKTOTAL` and `TOTALTRACKS`
APEv2	`Track`
iTunes MP4	`trkn`
ASF/Windows Media	n/a
RIFF INFO	n/a

Track Number

Internal Name	`tracknumber`
ID3v2	`TRCK`
Vorbis	`TRACKNUMBER`
APEv2	`Track`
iTunes MP4	`trkn`
ASF/Windows Media	`WM/TrackNumber`
RIFF INFO	`ITRK`

Track Title 

Internal Name	`title`
ID3v2	`TIT2`
Vorbis	`TITLE`
APEv2	`Title`
iTunes MP4	`©nam`
ASF/Windows Media	`Title`
RIFF INFO	`INAM`

Track Title Sort Order ^[4]

Internal Name	`titlesort`
ID3v2	`TSOT`
Vorbis	`TITLESORT`
APEv2	`TITLESORT`
iTunes MP4	`sonm`
ASF/Windows Media	`WM/TitleSortOrder`
RIFF INFO	n/a

Website (official artist website)

Internal Name	`website`
ID3v2	`WOAR`
Vorbis	`WEBSITE`
APEv2	`Weblink`
iTunes MP4	n/a
ASF/Windows Media	`WM/AuthorURL` (Picard>=1.3.1)
RIFF INFO	n/a

Work Title

Internal Name	`work` (Picard>=1.3)
ID3v2	`TXXX:WORK` `TIT1` ^[8]
Vorbis	`WORK`
APEv2	`WORK`
iTunes MP4	`©wrk` (Picard>=2.1)
ASF/Windows Media	`WM/Work`
RIFF INFO	n/a

Writer ^[2]

Internal Name	`writer`
ID3v2	`TXXX:Writer` (Picard>=1.3)
Vorbis	`WRITER`
APEv2	`Writer`
iTunes MP4	n/a
ASF/Windows Media	n/a
RIFF INFO	`IWRI`

Notes:

Taken from the earliest release in the release group.
Used when uncertain whether composer or lyricist.
This is populated by LastFMPlus plugin and not by stock Picard.
This is not able to be populated by stock Picard. It may be used and populated by certain plugins.
For Picard>=1.3 this indicates a Various Artists album; for Picard<=1.2 this indicates albums with tracks by different artists which is incorrect (e.g.: an original album with a duet with a feat. artist would show as a Compilation). In neither case does this indicate a MusicBrainz Release Group subtype of compilation.
Release-level license relationship type.
Recording-level license relationship type.
With “Save iTunes compatible grouping and work” (since Picard>=2.1.0)
From iTunes Metadata Format Specification
For compatibility reasons the date tag gets filled with the release date from MusicBrainz. This is how most software interprets this tag. Since Picard 2.9 the separate releasedate exists for use by scripts and plugins, but is not filled by default.

Appendix B: Tag Mapping

AcoustID

AcoustID Fingerprint

Album Artist Sort Order

Album Sort Order [4]

Artist Sort Order

Artists

BPM [4]

Comment [4]

Compilation (iTunes) [5]

Composer Sort Order

Copyright [4]

Date [10]

Director

Disc Number

Disc Subtitle

Encoded By [4]

Encoder Settings [4]

Gapless Playback [4]

Grouping [3]

Initial Key

Language

License [6, 7]

Lyrics [4]

Mood [3]

Movement [4]

Movement Count [4]

Movement Number [4]

MusicBrainz Release Group ID

MusicBrainz Work ID

MusicIP Fingerprint

Original Album

Original Artist

Original Filename

Original Release Date [1]

Original Release Year [1]

Performer

Podcast [4]

Podcast URL [4]

Release Date [10]

ReplayGain Album Gain

ReplayGain Album Peak

ReplayGain Album Range

ReplayGain Reference Loudness

ReplayGain Track Gain

ReplayGain Track Peak

ReplayGain Track Range

Script

Show Name [4]

Show Name Sort Order [4]

Show Work & Movement [4]

Subtitle [4]

Total Discs

Total Tracks

Track Number

Track Title Sort Order [4]

Website (official artist website)

Work Title

Writer [2]

Album Sort Order ^[4]

BPM ^[4]

Comment ^[4]

Compilation (iTunes) ^[5]

Copyright ^[4]

Date ^[10]

Encoded By ^[4]

Encoder Settings ^[4]

Gapless Playback ^[4]

Grouping ^[3]

License ^{[6, 7]}

Lyrics ^[4]

Mood ^[3]

Movement ^[4]

Movement Count ^[4]

Movement Number ^[4]

Original Release Date ^[1]

Original Release Year ^[1]

Podcast ^[4]

Podcast URL ^[4]

Release Date ^[10]

Show Name ^[4]

Show Name Sort Order ^[4]

Show Work & Movement ^[4]

Subtitle ^[4]

Track Title Sort Order ^[4]

Writer ^[2]