======================== unified (from filesystem) ========================
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                                        'duration'  '174'
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                                           'title'  "Hey, Good Lookin'"
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                                      'lastfmtags'  "['country', 'singer songwriter', 'americana', 'folk', 'classic country']"
                             'musicbrainz_albumid'  ''
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                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
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                                      'tracktotal'  '20'
                                            'date'  '1951'
                                        'comments'  ''
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                                             'bpm'  '141.6'
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                                        'acoustid'  ''
rest: ''

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

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'TBPM' (BPM (beats per minute))                     '141.6'
'TCON' (Content type, a.k.a. Genre)                 'loc-namerica-country'
'TDRC' (Recording time)                             '1951'
'TENC' (Encoded by)                                 'iTunes 10.6.3'
'TIT2' (Title/songname/content description)         "Hey, Good Lookin'"
'TKEY' (Initial key)                                '8B'
'TPE1' (Lead performer(s)/Soloist(s))               'Hank Williams'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '20/20'
'TRCK' (Track number/Position in set)               '8/20'
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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'                                   ['country', 'singer songwriter', 'americana', 'folk', 'classic country']
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'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
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'TXXX:q-piano'                                      '1'
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========================== row from database ==========================
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                                         'working'  None
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                                    'duration_sec'  174
                                           'genre'  loc-namerica-country
                                        'filesize'  1401395
                                           'mtime'  1621628460
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                                     'tag_release'  The History of Country & Western Music Vol.20
                                       'tag_title'  Hey, Good Lookin'
                                             'bpm'  141.6
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                                   'search_artist'  'hank':1 'williams':2
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                                    'tag_tracknum'  8
                                      'num_images'  0
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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-3', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
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                                        'tag_date'  1951
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621628460.1258934  (2021-05-21 22:21:00)
                             'size'  1401395