Dear beets developer,

I have started using beets since a couple of week and I have decided to 
move my metadata work from Picard to Beets.

I have controlled the differences between the metadata written by picard 
and beets, here are my considerations. For my research I have used this 
table map directly from musicbrainz site:
/https://picard.musicbrainz.org/docs/mappings/ and the official flac 
metadata inspection tool "metaflac"

The track I used for the comparison is:  
http://musicbrainz.org/release/43dd0b85-0f22-3fa4-80d8-e49c7310af83

First of all I cleaned all the metadata with metaflac:

metaflac --remove --block-type=VORBIS_COMMENT ./01\ -\ Koö\,\ January\ 24\,\ 
1975\,\ Part\ I\ \(1\).flac

After the clean up here and a new metadatation, here are the two results:


With *Beets*:


metaflac --list --block-type=VORBIS_COMMENT ./01\ -\ Köln\,\ January\ 24\,\ 
1975\,\ Part\ I.flac 
METADATA block #2
  type: 4 (VORBIS_COMMENT)
  is last: false
  length: 1232
  vendor string: Mutagen 1.32
  comments: 51
    comment[0]: ACOUSTID_FINGERPRINT=
    comment[1]: ACOUSTID_ID=
    comment[2]: ALBUM=The Köln Concert
    comment[3]: ALBUM ARTIST=Keith Jarrett
    comment[4]: ALBUMARTIST=Keith Jarrett
    comment[5]: ALBUMARTIST_CREDIT=Keith Jarrett
    comment[6]: ALBUMARTISTSORT=Jarrett, Keith
    comment[7]: MUSICBRAINZ_ALBUMCOMMENT=
    comment[8]: MUSICBRAINZ_ALBUMSTATUS=Official
    comment[9]: MUSICBRAINZ_ALBUMTYPE=live
    comment[10]: ARTIST=Keith Jarrett
    comment[11]: ARTIST_CREDIT=Keith Jarrett
    comment[12]: ARTISTSORT=Jarrett, Keith
    comment[13]: ASIN=B0000262WI
    comment[14]: BPM=0
    comment[15]: CATALOGNUMBER=ECM 1064 /65
    comment[16]: DESCRIPTION=
    comment[17]: COMMENT=
    comment[18]: COMPILATION=0
    comment[19]: COMPOSER=
    comment[20]: RELEASECOUNTRY=DE
    comment[21]: DATE=1983
    comment[22]: YEAR=1983
    comment[23]: DISC=1
    comment[24]: DISCNUMBER=1
    comment[25]: DISCSUBTITLE=
    comment[26]: DISCTOTAL=1
    comment[27]: DISCC=1
    comment[28]: TOTALDISCS=1
    comment[29]: ENCODEDBY=
    comment[30]: ENCODER=
    comment[31]: GENRE=
    comment[32]: GROUPING=
    comment[33]: LABEL=ECM
    comment[34]: PUBLISHER=ECM
    comment[35]: LANGUAGE=eng
    comment[36]: LYRICS=
    comment[37]: MUSICBRAINZ_ALBUMARTISTID=061c4920-3ea6-4835-98f6-
02f3b82f5e3a
    comment[38]: MUSICBRAINZ_ALBUMID=43dd0b85-0f22-3fa4-80d8-e49c7310af83
    comment[39]: MUSICBRAINZ_ARTISTID=061c4920-3ea6-4835-98f6-02f3b82f5e3a
    comment[40]: MUSICBRAINZ_RELEASEGROUPID=516d4629-7bf3-3ac3-907a-
ed9a022db840
    comment[41]: MUSICBRAINZ_TRACKID=efa85037-66ba-4910-ab97-86124ea515f3
    comment[42]: MEDIA=CD
    comment[43]: ORIGINALDATE=1975-11-30
    comment[44]: SCRIPT=Latn
    comment[45]: TITLE=Köln, January 24, 1975, Part I
    comment[46]: TRACK=1
    comment[47]: TRACKNUMBER=1
    comment[48]: TRACKTOTAL=4
    comment[49]: TRACKC=4
    comment[50]: TOTALTRACKS=4


With *Picard*:

metaflac --list --block-type=VORBIS_COMMENT ./01\ -\ Köln\,\ January\ 24\,\ 
1975\,\ Part\ I\ \(1\).flac 
METADATA block #2
  type: 4 (VORBIS_COMMENT)
  is last: false
  length: 1101
  vendor string: Mutagen 1.27
  comments: 37
    comment[0]: BARCODE=042281006722
    comment[1]: PRODUCER=Manfred Eicher
    comment[2]: TITLE=Köln, January 24, 1975, Part I
    comment[3]: RELEASECOUNTRY=DE
    comment[4]: TOTALDISCS=1
    comment[5]: LABEL=ECM
    comment[6]: TOTALTRACKS=4
    comment[7]: COMPOSERSORT=Jarrett, Keith
    comment[8]: MUSICBRAINZ_ALBUMARTISTID=061c4920-3ea6-4835-98f6-
02f3b82f5e3a
    comment[9]: COMPOSER=Keith Jarrett
    comment[10]: DATE=1983
    comment[11]: DISCNUMBER=1
    comment[12]: TRACKTOTAL=4
    comment[13]: MUSICBRAINZ_RELEASETRACKID=d4755323-4a9c-3edd-8794-
dc846e7ad868
    comment[14]: ASIN=B0000262WI
    comment[15]: ALBUMARTISTSORT=Jarrett, Keith
    comment[16]: ORIGINALDATE=1975-11-30
    comment[17]: SCRIPT=Latn
    comment[18]: MUSICBRAINZ_ALBUMID=43dd0b85-0f22-3fa4-80d8-e49c7310af83
    comment[19]: RELEASESTATUS=official
    comment[20]: ALBUMARTIST=Keith Jarrett
    comment[21]: CATALOGNUMBER=ECM 1064 /65
    comment[22]: ENGINEER=Martin Wieland
    comment[23]: ALBUM=The Köln Concert
    comment[24]: MUSICBRAINZ_ARTISTID=061c4920-3ea6-4835-98f6-02f3b82f5e3a
    comment[25]: MEDIA=CD
    comment[26]: RELEASETYPE=album
    comment[27]: RELEASETYPE=live
    comment[28]: ORIGINALYEAR=1975
    comment[29]: ISRC=DEA097500010
    comment[30]: DISCTOTAL=1
    comment[31]: ARTIST=Keith Jarrett
    comment[32]: MUSICBRAINZ_RELEASEGROUPID=516d4629-7bf3-3ac3-907a-
ed9a022db840
    comment[33]: MUSICBRAINZ_TRACKID=efa85037-66ba-4910-ab97-86124ea515f3
    comment[34]: ARTISTSORT=Jarrett, Keith
    comment[35]: ARTISTS=Keith Jarrett
    comment[36]: TRACKNUMBER=1


I have then checked the differences and here are the result:

*Unique field present in Beets*:

    comment[0]: ACOUSTID_FINGERPRINT=
    comment[1]: ACOUSTID_ID=
    comment[4]: ALBUMARTIST=Keith Jarrett
    comment[5]: ALBUMARTIST_CREDIT=Keith Jarrett
    comment[7]: MUSICBRAINZ_ALBUMCOMMENT=
    comment[8]: MUSICBRAINZ_ALBUMSTATUS=Official
    comment[9]: MUSICBRAINZ_ALBUMTYPE=live
    comment[11]: ARTIST_CREDIT=Keith Jarrett
    comment[14]: BPM=0
    comment[16]: DESCRIPTION=
    comment[17]: COMMENT=
    comment[18]: COMPILATION=0
    comment[19]: COMPOSER=
    comment[22]: YEAR=1983
    comment[23]: DISC=1
    comment[25]: DISCSUBTITLE=
    comment[27]: DISCC=1
    comment[29]: ENCODEDBY=
    comment[30]: ENCODER=
    comment[31]: GENRE=
    comment[32]: GROUPING=
    comment[34]: PUBLISHER=ECM
    comment[35]: LANGUAGE=eng
    comment[36]: LYRICS=
    comment[46]: TRACK=1
    comment[49]: TRACKC=4


*Unique fields present in Picard*:
    comment[0]: BARCODE=042281006722
    comment[1]: PRODUCER=Manfred Eicher
    comment[7]: COMPOSERSORT=Jarrett, Keith
    comment[9]: COMPOSER=Keith Jarrett
    comment[13]: MUSICBRAINZ_RELEASETRACKID=d4755323-4a9c-3edd-8794-
dc846e7ad868
    comment[19]: RELEASESTATUS=official
    comment[22]: ENGINEER=Martin Wieland
    comment[26]: RELEASETYPE=album
    comment[27]: RELEASETYPE=live
    comment[28]: ORIGINALYEAR=1975
    comment[29]: ISRC=DEA097500010
    comment[35]: ARTISTS=Keith Jarrett

Some considerations:

   - There are more fields in beets than in Picard this is very good! I 
   think that using all the Musicbrainz field is the goal here. 
   - Some fields in Picard are not used in 
   beets: BARCODE, PRODUCER, MUSICBRAINZ_RELEASETRACKID, ENGINEER, ISRC
   - RELEASESTATUS is the vorbis jargon of MUSICBRAINZ_ALBUMSTATUS which is 
APEv2. 
   Here I think beets could use the correct Vorbis Jargon not the APE one.
   - COMPOSER and COMPOSERSORT are present in Picard left empty in Beets. 
   This is strange... Maybe a bug ????
   - RELEASETYPE is vorbis jargon (Picard), MUSICBRAINZ_ALBUMTYPE is APE2 
   jargon. Beets maybe could use Vorbis instead of APE.
   - Picard use two RELEASETYPE (Album + Live) Beets just one; actually 
   dropping "Album". I don't which could be the correct one, maybe using both 
   as indicated in MusicBrainz?
   - ORIGINALYEAR is dropped in beets. There's a more 
   complete ORIGINALDATE. And you can use $original_year in your path 
   composition. Anyway could be worth to keep both for legacy software 
   compatibility? 
   - ARTISTS (plural) this is a strange Picard only field. Maybe is a list 
   of artists if the release is a collection? I don't know.
   

What do you think about the analysis ? I really hope that this comparison 
of mine will be useful to you for letting beets be the best tagging tool on 
the web!

Regards,
Stefano Bossi

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