======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '143'
                                          'artist'  'Coldplay'
                                     'text_people'  ''
                                         'release'  "You Can't Judge a Song By Its Cover"
                                           'title'  'Hunting High and Low (A-Ha Cover Live)'
                                           'quals'  ("['Q-HAP-2', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', 'Q-OLDST-3', "
 "'Q-LOCALNESS-1', 'Q-PLAY-2', 'q-syn-2', 'q-bass-1', 'q-busy-3', 'q-grit-2', "
 "'Q-PIANO-4', 'q-chart-2', 'q-drums-1', 'q-other-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['alternative rock', 'indie', 'alternative', 'britpop', 'rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'set-cover or covered-styled;set-cover or covered'
                                             'bpm'  '132.271'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'POPM:no@email'                                     POPM(email='no@email', rating=64, count=0)
'PRIV:AverageLevel:\x05\x15\x00\x00'                PRIV(owner='AverageLevel', data=b'\x05\x15\x00\x00')
'PRIV:PeakValue: