======================== unified (from filesystem) ========================
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                                        'duration'  '179'
                                          'artist'  'John Lee Hooker'
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                                           'title'  'One Burbon, One Scotch, One Beer'
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                                      'lastfmtags'  "['guitar', 'blues', 'jazz', 'delta blues', 'classic blues']"
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                                     'tracknumber'  '8'
                                      'tracktotal'  '18'
                                            'date'  '1991'
                                        'comments'  ''
                                           'genre'  'prerock-jb-blues'
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======================== rawer (from filesystem) ========================

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'TDOR' (Original release time)                      '1991'
'TDRC' (Recording time)                             '1991'
'TIT2' (Title/songname/content description)         'One Burbon, One Scotch, One Beer'
'TKEY' (Initial key)                                '6A'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'John Lee Hooker'
'TPE2' (Band/orchestra/accompaniment)               'John Lee Hooker'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'MCA Records'
'TRCK' (Track number/Position in set)               '8/18'
'TSO2'                                              'Hooker, John Lee'
'TSOP' (Performer sort order)                       'Hooker, John Lee'
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'TXXX:MusicBrainz Album Type'                       'compilation'
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'TXXX:lastfmtags'                                   ['guitar', 'blues', 'jazz', 'delta blues', 'classic blues']
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                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/John Lee Hooker - Chess For Blues/One bourbon, one scotch, one beer.mp3
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                                    'duration_sec'  179
                                           'genre'  prerock-jb-blues
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                                           'mtime'  1620402330
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                                      'tag_artist'  John Lee Hooker
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                                       'tag_title'  One Burbon, One Scotch, One Beer
                                             'bpm'  124.0
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                                   'search_artist'  'hooker':3 'john':1 'lee':2
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                                    'tag_tracknum'  8
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-2', 'q-drums-2', 'q-syn-1', 'q-chart-3', 'q-other-3', 'Q-HAP-2', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['guitar', 'blues', 'jazz', 'delta blues', 'classic blues']
                                        'tag_date'  1991
                                     'discogstags'  ['blues', 'electric blues', 'chicago blues']

============================== file details ==============================
                                           'mtime'  1620402330.3977377  (2021-05-07 17:45:30)
                             'size'  5748557