======================== unified (from filesystem) ========================
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                                        'duration'  '159'
                                          'artist'  'Johnny Bond'
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                                           'title'  'Sick, Sober and Sorry'
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                                      'lastfmtags'  "['classic country', 'country', 'honky tonk', 'rockabilly', 'rock n roll']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
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                                      'tracktotal'  '20'
                                            'date'  '1951'
                                        'comments'  ''
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rest: ''

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

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'TCON' (Content type, a.k.a. Genre)                 'loc-namerica-country'
'TDRC' (Recording time)                             '1951'
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'TIT2' (Title/songname/content description)         'Sick, Sober and Sorry'
'TKEY' (Initial key)                                '11B'
'TPE1' (Lead performer(s)/Soloist(s))               'Johnny Bond'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '20/20'
'TRCK' (Track number/Position in set)               '10/20'
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'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '2'
'TXXX:lastfmtags'                                   ['classic country', 'country', 'honky tonk', 'rockabilly', 'rock n roll']
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========================== row from database ==========================
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                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Vol 20/10. Johnny Bond - Sick, Sober and Sorry.mp3
                                         'working'  None
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                                    'duration_sec'  159
                                           'genre'  loc-namerica-country
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                                           'mtime'  1621628460
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                                       'tag_title'  Sick, Sober and Sorry
                                             'bpm'  138.6
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                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-1', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
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                                        'tag_date'  1951
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621628460.147659  (2021-05-21 22:21:00)
                             'size'  1274766