======================== unified (from filesystem) ========================
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                                        'duration'  '128'
                                          'artist'  'Gene Autry'
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                                         'release'  'The History of Country & Western Music Vol.11'
                                           'title'  'Sioux City Sue'
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                             'musicbrainz_albumid'  ''
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                            'musicbrainz_artistid'  ''
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                                     'tracknumber'  '15'
                                      'tracktotal'  '20'
                                            'date'  '1946'
                                        'comments'  ''
                                           'genre'  'loc-namerica-country'
                                             'bpm'  '103.3'
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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)                             '1946'
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'TIT2' (Title/songname/content description)         'Sioux City Sue'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Gene Autry'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '11/20'
'TRCK' (Track number/Position in set)               '15/20'
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'TXXX:Q-UNU'                                        '2'
'TXXX:lastfmtags'                                   ['classic country',
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'TXXX:q-drums'                                      '1'
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========================== row from database ==========================
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                                         'working'  None
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                                    'duration_sec'  128
                                           'genre'  loc-namerica-country
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                                       'tag_title'  Sioux City Sue
                                             'bpm'  103.3
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                                   'search_artist'  'autry':2 'gene':1
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                                    'tag_tracknum'  15
                                      'num_images'  0
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                                        'tag_date'  1946
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621628454.8355625  (2021-05-21 22:20:54)
                             'size'  1030435