======================== unified (from filesystem) ========================
                                         'bitrate'  '256.0'
                                        'duration'  '139'
                                          'artist'  'Igor & The Maniacs'
                                     'text_people'  ''
                                         'release'  'Wavy Gravy'
                                           'title'  'The Big Green'
                                           'quals'  ("['Q-HAP-2', 'Q-JZFKS-1', 'Q-UNU-1', 'q-syn-2', 'q-bass-3', 'q-busy-3', "
 "'q-grit-2', 'q-play-2', 'Q-OLDST-3', 'q-chart-1', 'q-drums-4', 'q-other-2', "
 "'q-piano-1', 'q-vocals-3', 'Q-HHRNBTT-1', 'q-mixbeat-1', 'Q-LOCALNESS-1']")
                                      'lastfmtags'  "['garage', 'sixtie rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '09'
                                      'tracktotal'  ''
                                            'date'  '1990'
                                        'comments'  ''
                                           'genre'  'electronic-unsorted'
                                             'bpm'  '115.9'
                                             'key'  '1A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'PRIV:AverageLevel:\x07\x12\x00\x00'                PRIV(owner='AverageLevel', data=b'\x07\x12\x00\x00')
'PRIV:PeakValue: