======================== unified (from filesystem) ========================
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                                        'duration'  '846'
                                          'artist'  'Bruno Walter, Columbia Symphony Orchestra'
                                     'text_people'  'Brahms, Johannes'
                                         'release'  'Nodame Cantabile Best100'
                                           'title'  'Symphony #1 in C minor, Op.68 - 1st Movement'
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                                      'tracktotal'  '8'
                                            'date'  '1959'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '101.1'
                                             'key'  '6A'
                                        'acoustid'  ''
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======================== rawer (from filesystem) ========================

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'TCOM' (Composer)                                   'Brahms, Johannes'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1959'
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'TIT2' (Title/songname/content description)         'Symphony #1 in C minor, Op.68 - 1st Movement'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Bruno Walter, Columbia Symphony Orchestra'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '6/8'
'TRCK' (Track number/Position in set)               '4/8'
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'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:q-bass'                                       '1'
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========================== row from database ==========================
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                                            'path'  /data/Music/Bulk/00instruments-classical/Compilations/Nodame Cantabile Best100/6-04 Symphony #1 in C minor, Op.68 - 1st Movement.mp3
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                                    'duration_sec'  846
                                           'genre'  prerock-classical or classical instruments
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                                    'tag_tracknum'  4
                                      'num_images'  1
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-3', 'q-syn-1', 'q-chart-3', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  []
                                        'tag_date'  1959
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561517.9550135  (2021-05-09 13:58:37)
                             'size'  20353356