======================== unified (from filesystem) ========================
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                                        'duration'  '255'
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                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '17'
                                      'tracktotal'  '18'
                                            'date'  '1972'
                                        'comments'  ''
                                           'genre'  'ifs-songwriter-eos;set-pl-sced'
                                             'bpm'  '103'
                                             'key'  '8A'
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'TDOR' (Original release time)                      '1972'
'TDRC' (Recording time)                             '1972'
'TIT2' (Title/songname/content description)         'Starman (instrumental)'
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'TPE1' (Lead performer(s)/Soloist(s))               'David Bowie'
'TPE2' (Band/orchestra/accompaniment)               'David Bowie'
'TPOS' (Part of a set)                              '1/1'
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'TSO2'                                              'Bowie, David'
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'TXXX:originalyear'                                 '1972'
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========================== row from database ==========================
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                                            'path'  /data/Music/Bulk/00singer-songwriter-eos/David Bowie/[1972] Ziggy Stardust/17 Bonus - Starman (Instrumental).mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  255
                                           'genre'  ifs-songwriter-eos;set-pl-sced
                                        'filesize'  4179834
                                           'mtime'  1637330491
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                                      'tag_artist'  David Bowie
                                     'tag_release'  The Rise and Fall of Ziggy Stardust and the Spiders From Mars
                                       'tag_title'  Starman (instrumental)
                                             'bpm'  103.0
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                                    'tag_tracknum'  17
                                      'num_images'  1
                                             'key'  8A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-4', 'q-other-4', 'Q-HAP-2', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['classic rock', '80s', 'alternative', 'rock', 'glam rock']
                                        'tag_date'  1972
                                     'discogstags'  ['rock', 'pop', 'art rock']

============================== file details ==============================
                                           'mtime'  1637330491.217866  (2021-11-19 15:01:31)
                             'size'  4179834