======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '652'
                                          'artist'  'Sergei Rachmaninoff'
                                     'text_people'  ''
                                         'release'  'Rachmaninoff Plays Rachmaninoff: Concertos 2 & 3'
                                           'title'  'Piano Concerto no. 2 in C minor, op. 18: II. Adagio sostenuto'
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                                      'lastfmtags'  "['russian', 'composers', 'piano', 'romantic', 'classical']"
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                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '2'
                                      'tracktotal'  '6'
                                            'date'  '1987'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '138.9'
                                             'key'  '12B'
                                        'acoustid'  ''
rest: ''

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

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