How to use the mediafile.MP3DescStorageStyle function in mediafile

ASFStorageStyle('MusicBrainz/Release Track Id'),
    )
    mb_workid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Work Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Work Id'),
        StorageStyle('MUSICBRAINZ_WORKID'),
        ASFStorageStyle('MusicBrainz/Work Id'),
    )
    mb_albumid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Album Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Album Id'),
        StorageStyle('MUSICBRAINZ_ALBUMID'),
        ASFStorageStyle('MusicBrainz/Album Id'),
    )
    mb_artistid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Artist Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Artist Id'),
        StorageStyle('MUSICBRAINZ_ARTISTID'),
        ASFStorageStyle('MusicBrainz/Artist Id'),
    )
    mb_albumartistid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Album Artist Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Album Artist Id'),
        StorageStyle('MUSICBRAINZ_ALBUMARTISTID'),
        ASFStorageStyle('MusicBrainz/Album Artist Id'),
    )
    mb_releasegroupid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Release Group Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Release Group Id'),
        StorageStyle('MUSICBRAINZ_RELEASEGROUPID'),
        ASFStorageStyle('MusicBrainz/Release Group Id'),
    )

acoustid_fingerprint = MediaField(
        MP3DescStorageStyle(u'Acoustid Fingerprint'),
        MP4StorageStyle('----:com.apple.iTunes:Acoustid Fingerprint'),
        StorageStyle('ACOUSTID_FINGERPRINT'),
        ASFStorageStyle('Acoustid/Fingerprint'),
    )
    acoustid_id = MediaField(
        MP3DescStorageStyle(u'Acoustid Id'),
        MP4StorageStyle('----:com.apple.iTunes:Acoustid Id'),
        StorageStyle('ACOUSTID_ID'),
        ASFStorageStyle('Acoustid/Id'),
    )

    # ReplayGain fields.
    rg_track_gain = MediaField(
        MP3DescStorageStyle(
            u'REPLAYGAIN_TRACK_GAIN',
            float_places=2, suffix=u' dB'
        ),
        MP3DescStorageStyle(
            u'replaygain_track_gain',
            float_places=2, suffix=u' dB'
        ),
        MP3SoundCheckStorageStyle(
            key='COMM',
            index=0, desc=u'iTunNORM',
            id3_lang='eng'
        ),
        MP4StorageStyle(
            '----:com.apple.iTunes:replaygain_track_gain',
            float_places=2, suffix=' dB'
        ),

MP3DescStorageStyle(
            u'R128_TRACK_GAIN'
        ),
        MP4StorageStyle(
            '----:com.apple.iTunes:R128_TRACK_GAIN'
        ),
        StorageStyle(
            u'R128_TRACK_GAIN'
        ),
        ASFStorageStyle(
            u'R128_TRACK_GAIN'
        ),
    )
    r128_album_gain = QNumberField(
        8,
        MP3DescStorageStyle(
            u'R128_ALBUM_GAIN'
        ),
        MP4StorageStyle(
            '----:com.apple.iTunes:R128_ALBUM_GAIN'
        ),
        StorageStyle(
            u'R128_ALBUM_GAIN'
        ),
        ASFStorageStyle(
            u'R128_ALBUM_GAIN'
        ),
    )

    initial_key = MediaField(
        MP3StorageStyle('TKEY'),
        MP4StorageStyle('----:com.apple.iTunes:initialkey'),

ASFStorageStyle('MusicBrainz/Work Id'),
    )
    mb_albumid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Album Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Album Id'),
        StorageStyle('MUSICBRAINZ_ALBUMID'),
        ASFStorageStyle('MusicBrainz/Album Id'),
    )
    mb_artistid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Artist Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Artist Id'),
        StorageStyle('MUSICBRAINZ_ARTISTID'),
        ASFStorageStyle('MusicBrainz/Artist Id'),
    )
    mb_albumartistid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Album Artist Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Album Artist Id'),
        StorageStyle('MUSICBRAINZ_ALBUMARTISTID'),
        ASFStorageStyle('MusicBrainz/Album Artist Id'),
    )
    mb_releasegroupid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Release Group Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Release Group Id'),
        StorageStyle('MUSICBRAINZ_RELEASEGROUPID'),
        ASFStorageStyle('MusicBrainz/Release Group Id'),
    )

    # Acoustid fields.
    acoustid_fingerprint = MediaField(
        MP3DescStorageStyle(u'Acoustid Fingerprint'),
        MP4StorageStyle('----:com.apple.iTunes:Acoustid Fingerprint'),
        StorageStyle('ACOUSTID_FINGERPRINT'),

ASFStorageStyle('MusicBrainz/Track Id'),
    )
    mb_releasetrackid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Release Track Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Release Track Id'),
        StorageStyle('MUSICBRAINZ_RELEASETRACKID'),
        ASFStorageStyle('MusicBrainz/Release Track Id'),
    )
    mb_workid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Work Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Work Id'),
        StorageStyle('MUSICBRAINZ_WORKID'),
        ASFStorageStyle('MusicBrainz/Work Id'),
    )
    mb_albumid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Album Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Album Id'),
        StorageStyle('MUSICBRAINZ_ALBUMID'),
        ASFStorageStyle('MusicBrainz/Album Id'),
    )
    mb_artistid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Artist Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Artist Id'),
        StorageStyle('MUSICBRAINZ_ARTISTID'),
        ASFStorageStyle('MusicBrainz/Artist Id'),
    )
    mb_albumartistid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Album Artist Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Album Artist Id'),
        StorageStyle('MUSICBRAINZ_ALBUMARTISTID'),
        ASFStorageStyle('MusicBrainz/Album Artist Id'),
    )

day = date.day_field()

    # *Original* release date.
    original_date = DateField(
        MP3StorageStyle('TDOR'),
        MP4StorageStyle('----:com.apple.iTunes:ORIGINAL YEAR'),
        StorageStyle('ORIGINALDATE'),
        ASFStorageStyle('WM/OriginalReleaseYear'))

    original_year = original_date.year_field()
    original_month = original_date.month_field()
    original_day = original_date.day_field()

    # Nonstandard metadata.
    artist_credit = MediaField(
        MP3DescStorageStyle(u'Artist Credit'),
        MP4StorageStyle('----:com.apple.iTunes:Artist Credit'),
        StorageStyle('ARTIST_CREDIT'),
        ASFStorageStyle('beets/Artist Credit'),
    )
    albumartist_credit = MediaField(
        MP3DescStorageStyle(u'Album Artist Credit'),
        MP4StorageStyle('----:com.apple.iTunes:Album Artist Credit'),
        StorageStyle('ALBUMARTIST_CREDIT'),
        ASFStorageStyle('beets/Album Artist Credit'),
    )

    # Legacy album art field
    art = CoverArtField()

    # Image list
    images = ImageListField()

ASFStorageStyle('MusicBrainz/Album Id'),
    )
    mb_artistid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Artist Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Artist Id'),
        StorageStyle('MUSICBRAINZ_ARTISTID'),
        ASFStorageStyle('MusicBrainz/Artist Id'),
    )
    mb_albumartistid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Album Artist Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Album Artist Id'),
        StorageStyle('MUSICBRAINZ_ALBUMARTISTID'),
        ASFStorageStyle('MusicBrainz/Album Artist Id'),
    )
    mb_releasegroupid = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Release Group Id'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Release Group Id'),
        StorageStyle('MUSICBRAINZ_RELEASEGROUPID'),
        ASFStorageStyle('MusicBrainz/Release Group Id'),
    )

    # Acoustid fields.
    acoustid_fingerprint = MediaField(
        MP3DescStorageStyle(u'Acoustid Fingerprint'),
        MP4StorageStyle('----:com.apple.iTunes:Acoustid Fingerprint'),
        StorageStyle('ACOUSTID_FINGERPRINT'),
        ASFStorageStyle('Acoustid/Fingerprint'),
    )
    acoustid_id = MediaField(
        MP3DescStorageStyle(u'Acoustid Id'),
        MP4StorageStyle('----:com.apple.iTunes:Acoustid Id'),
        StorageStyle('ACOUSTID_ID'),

ASFStorageStyle('Acoustid/Fingerprint'),
    )
    acoustid_id = MediaField(
        MP3DescStorageStyle(u'Acoustid Id'),
        MP4StorageStyle('----:com.apple.iTunes:Acoustid Id'),
        StorageStyle('ACOUSTID_ID'),
        ASFStorageStyle('Acoustid/Id'),
    )

    # ReplayGain fields.
    rg_track_gain = MediaField(
        MP3DescStorageStyle(
            u'REPLAYGAIN_TRACK_GAIN',
            float_places=2, suffix=u' dB'
        ),
        MP3DescStorageStyle(
            u'replaygain_track_gain',
            float_places=2, suffix=u' dB'
        ),
        MP3SoundCheckStorageStyle(
            key='COMM',
            index=0, desc=u'iTunNORM',
            id3_lang='eng'
        ),
        MP4StorageStyle(
            '----:com.apple.iTunes:replaygain_track_gain',
            float_places=2, suffix=' dB'
        ),
        MP4SoundCheckStorageStyle(
            '----:com.apple.iTunes:iTunNORM',
            index=0
        ),

)
    language = MediaField(
        MP3StorageStyle('TLAN'),
        MP4StorageStyle('----:com.apple.iTunes:LANGUAGE'),
        StorageStyle('LANGUAGE'),
        ASFStorageStyle('WM/Language'),
    )
    country = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Album Release Country'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz '
                        'Album Release Country'),
        StorageStyle('RELEASECOUNTRY'),
        ASFStorageStyle('MusicBrainz/Album Release Country'),
    )
    albumstatus = MediaField(
        MP3DescStorageStyle(u'MusicBrainz Album Status'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Album Status'),
        StorageStyle('RELEASESTATUS'),
        StorageStyle('MUSICBRAINZ_ALBUMSTATUS'),
        ASFStorageStyle('MusicBrainz/Album Status'),
    )
    media = MediaField(
        MP3StorageStyle('TMED'),
        MP4StorageStyle('----:com.apple.iTunes:MEDIA'),
        StorageStyle('MEDIA'),
        ASFStorageStyle('WM/Media'),
    )
    albumdisambig = MediaField(
        # This tag mapping was invented for beets (not used by Picard, etc).
        MP3DescStorageStyle(u'MusicBrainz Album Comment'),
        MP4StorageStyle('----:com.apple.iTunes:MusicBrainz Album Comment'),
        StorageStyle('MUSICBRAINZ_ALBUMCOMMENT'),

MP3StorageStyle('TPUB'),
        MP4StorageStyle('----:com.apple.iTunes:LABEL'),
        MP4StorageStyle('----:com.apple.iTunes:publisher'),
        MP4StorageStyle('----:com.apple.iTunes:Label', read_only=True),
        StorageStyle('LABEL'),
        StorageStyle('PUBLISHER'),  # Traktor
        ASFStorageStyle('WM/Publisher'),
    )
    artist_sort = MediaField(
        MP3StorageStyle('TSOP'),
        MP4StorageStyle('soar'),
        StorageStyle('ARTISTSORT'),
        ASFStorageStyle('WM/ArtistSortOrder'),
    )
    albumartist_sort = MediaField(
        MP3DescStorageStyle(u'ALBUMARTISTSORT'),
        MP4StorageStyle('soaa'),
        StorageStyle('ALBUMARTISTSORT'),
        ASFStorageStyle('WM/AlbumArtistSortOrder'),
    )
    asin = MediaField(
        MP3DescStorageStyle(u'ASIN'),
        MP4StorageStyle('----:com.apple.iTunes:ASIN'),
        StorageStyle('ASIN'),
        ASFStorageStyle('MusicBrainz/ASIN'),
    )
    catalognum = MediaField(
        MP3DescStorageStyle(u'CATALOGNUMBER'),
        MP4StorageStyle('----:com.apple.iTunes:CATALOGNUMBER'),
        StorageStyle('CATALOGNUMBER'),
        ASFStorageStyle('WM/CatalogNo'),
    )