======================== unified (from filesystem) ========================
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                                        'duration'  '305'
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                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
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                                      'tracktotal'  '11'
                                            'date'  '2005'
                                        'comments'  ''
                                           'genre'  'rock-gr-hard'
                                             'bpm'  '139'
                                             'key'  '2A'
                                        'acoustid'  '5892457c-3c37-48be-b28a-d97c94feb58c'
rest: ''

======================== rawer (from filesystem) ========================

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'TDOR' (Original release time)                      '2004'
'TDRC' (Recording time)                             '2005-03-29'
'TIT2' (Title/songname/content description)         'Bend the Bracket'
'TKEY' (Initial key)                                '2A'
'TMED' (Media type)                                 'DualDisc'
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'TPE2' (Band/orchestra/accompaniment)               'Chevelle'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'Epic'
'TRCK' (Track number/Position in set)               '11/11'
'TSO2'                                              'Chevelle'
'TSOP' (Performer sort order)                       'Chevelle'
'TSRC' (ISRC (international standard recording code))  'USSM10410122'
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'TXXX:Artists'                                      'Chevelle'
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'TXXX:MusicBrainz Album Id'                         '1e906966-2baa-3f04-86b4-f11c012eaaea'
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'TXXX:Q-LOCALNESS'                                  '1'
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'TXXX:lastfmtags'                                   ['alternative rock', 'alternative metal', 'rock', 'alternative', 'hard rock']
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'TXXX:q-play'                                       '3'
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                                              'id'  1304589
                                            'path'  /data/Music/Bulk/00dwimp/Chevelle/This Type Of Thinking (Could Do Us In)/11 - Bend The Bracket.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  305
                                           'genre'  rock-gr-hard
                                        'filesize'  7389110
                                           'mtime'  1636902805
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                                             'bpm'  139.0
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                                   'search_artist'  'chevelle':1
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                                     'search_rest'  '00dwimp':1 'gr':5 'hard':6 'of':2 'rock':4 'the':3
                                    'search_combo'  '00dwimp':15 'bend':1A 'bracket':3A 'chevelle':4B 'could':9C,10C 'do':11C 'gr':19 'hard':20 'in':13C,14C 'of':7C,16 'rock':18 'the':2A,17 'thinking':8C 'this':5C 'type':6C 'us':12C
                                    'tag_tracknum'  11
                                      'num_images'  1
                                             'key'  2A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-syn-2', 'q-chart-4', 'q-other-3', 'Q-HAP-2', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['alternative rock', 'alternative metal', 'rock', 'alternative', 'hard rock']
                                        'tag_date'  2005
                                     'discogstags'  ['electronic', 'garage house']

============================== file details ==============================
                                           'mtime'  1636902804.5580266  (2021-11-14 16:13:24)
                             'size'  7389110