======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '26'
                                          'artist'  'Gary Graffman'
                                     'text_people'  'Brahms, Johannes'
                                         'release'  'Nodame Cantabile Best100'
                                           'title'  'Variation on a theme by Paganini, Op.35 - Book II, Variation 11'
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                                      'lastfmtags'  "['american', 'piano', 'composer', 'classical', 'classic']"
                                     'discogstags'  "['classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '27'
                                      'tracktotal'  '36'
                                            'date'  '1967'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '120.9'
                                             'key'  '8B'
                                        'acoustid'  ''
rest: ''

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

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