======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '840'
                                          'artist'  'Rachmaninoff; Stokowski, Ormandy, The Philadelphia Orchestra'
                                     'text_people'  ''
                                         'release'  'Rachmaninoff Plays Rachmaninoff: Concertos 2 & 3'
                                           'title'  'Piano Concerto no. 3 in D minor, op. 30: I. Allegro ma non tanto'
                                           'quals'  ("['q-mix-1', 'q-bass-1', 'q-play-3', 'q-chart-2', 'q-drums-1', 'q-other-4', "
 "'q-piano-2', 'q-vocals-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '4'
                                      'tracktotal'  '6'
                                            'date'  '1987'
                                        'comments'  ''
                                           'genre'  'classical or classical instruments'
                                             'bpm'  '148'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
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