======================== unified (from filesystem) ========================
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                                        'duration'  '139'
                                          'artist'  'Robert Johnson'
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                                         'release'  'The Complete Recordings (disc 2)'
                                           'title'  "Milkcow's Calf Blues (Take 3)"
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                                      'lastfmtags'  "['guitar', 'acoustic', 'blues', 'delta blues', 'folk']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '21'
                                      'tracktotal'  ''
                                            'date'  '1990'
                                        'comments'  ''
                                           'genre'  'prerock-jb-blues'
                                             'bpm'  '91.185'
                                             'key'  '6B'
                                        'acoustid'  ''
rest: ''

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

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'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-blues'
'TDRC' (Recording time)                             '1990'
'TIT2' (Title/songname/content description)         "Milkcow's Calf Blues (Take 3)"
'TKEY' (Initial key)                                '6B'
'TPE1' (Lead performer(s)/Soloist(s))               'Robert Johnson'
'TRCK' (Track number/Position in set)               '21'
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'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['guitar', 'acoustic', 'blues', 'delta blues', 'folk']
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                                              'id'  1508881
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Robert Johnson/Robert Johnson - The Complete Recordings (disc 2) - 21 - Milkcow_s Calf Blues (Take 3).mp3
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                                         'bitrate'  192
                                    'duration_sec'  139
                                           'genre'  prerock-jb-blues
                                        'filesize'  3348335
                                           'mtime'  1620402539
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                                      'tag_artist'  Robert Johnson
                                     'tag_release'  The Complete Recordings (disc 2)
                                       'tag_title'  Milkcow's Calf Blues (Take 3)
                                             'bpm'  91.185
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                                   'search_artist'  'johnson':2 'robert':1
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                                    'tag_tracknum'  21
                                      'num_images'  0
                                             'key'  6B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-3', 'Q-HAP-2', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['guitar', 'acoustic', 'blues', 'delta blues', 'folk']
                                        'tag_date'  1990
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620402539.3717115  (2021-05-07 17:48:59)
                             'size'  3348335