======================== unified (from filesystem) ========================
                                         'bitrate'  '213.627'
                                        'duration'  '501'
                                          'artist'  'Felix Mendelssohn'
                                     'text_people'  ''
                                         'release'  '100 Masterpieces, Volume 5: The Top 10 of Classical Music 1811-1841'
                                           'title'  'Symphony No. 4 in A major, Op. 90 "Italian": I. Allegro vivace'
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                                      'lastfmtags'  "['german', 'composers', 'piano', 'romantic', 'classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '8'
                                      'tracktotal'  '10'
                                            'date'  '1991'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '140'
                                             'key'  '11B'
                                        'acoustid'  ''
rest: ''

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

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