======================== unified (from filesystem) ========================
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                                        'duration'  '328'
                                          'artist'  'Glenn Gould'
                                     'text_people'  'Beethoven, Ludwig van'
                                         'release'  'Nodame Cantabile Best100'
                                           'title'  'Piano Sonata #23 in F minor, Op.57 "Appassionata" - 3rd Movement'
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                                      'lastfmtags'  "['piano', 'bach', 'baroque', 'classical', 'canadian']"
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                                      'tracktotal'  '36'
                                            'date'  '1967'
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                                             'bpm'  '140.0'
                                             'key'  '4A'
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'TCOM' (Composer)                                   'Beethoven, Ludwig van'
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'TDRC' (Recording time)                             '1967'
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'TIT2' (Title/songname/content description)         'Piano Sonata #23 in F minor, Op.57 "Appassionata" - 3rd Movement'
'TKEY' (Initial key)                                '4A'
'TPE1' (Lead performer(s)/Soloist(s))               'Glenn Gould'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '8/8'
'TRCK' (Track number/Position in set)               '33/36'
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'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '4'
'TXXX:Q-PLAY'                                       '3'
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========================== row from database ==========================
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                                            'path'  /data/Music/Bulk/00instruments-classical/Compilations/Nodame Cantabile Best100/8-33 Piano Sonata #23 in F minor, Op.57 _Appassionata_ - 3rd Movement.mp3
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                                         'bitrate'  192
                                    'duration_sec'  328
                                           'genre'  prerock-classical or classical instruments
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                                           'mtime'  1620574158
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                                        'rest_str'   00instruments classical Compilations 8 33 _Appassionata_ prerock classical classical instruments
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                                     'tag_release'  Nodame Cantabile Best100
                                       'tag_title'  Piano Sonata #23 in F minor, Op.57 "Appassionata" - 3rd Movement
                                             'bpm'  140.0
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                                    'tag_tracknum'  33
                                      'num_images'  1
                                             'key'  4A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-4', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-2', 'Q-HAP-3', 'Q-PLAY-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['piano', 'bach', 'baroque', 'classical', 'canadian']
                                        'tag_date'  1967
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620574158.4003706  (2021-05-09 17:29:18)
                             'size'  7922407