======================== unified (from filesystem) ========================
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                                        'duration'  '163'
                                          'artist'  'Johann Strauss II'
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                                           'title'  'Tritsch-Tratsch Polka, Op. 214'
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                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '9'
                                      'tracktotal'  '10'
                                            'date'  '1991'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '145.7'
                                             'key'  '12B'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
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'TCMP'                                              '1'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDOR' (Original release time)                      '1991'
'TDRC' (Recording time)                             '1991-03-19'
'TENC' (Encoded by)                                 'Exact Audio Copy   (Burst mode)'
'TIT2' (Title/songname/content description)         'Tritsch-Tratsch Polka, Op. 214'
'TKEY' (Initial key)                                '12B'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'Johann Strauss II'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'LaserLight Digital'
'TRCK' (Track number/Position in set)               '9/10'
'TSO2'                                              'Various Artists'
'TSOP' (Performer sort order)                       'Strauss, Johann II'
'TXXX:Artists'                                      'Johann Strauss II'
'TXXX:BARCODE'                                      '018111568227'
'TXXX:CATALOGNUMBER'                                '15 682'
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'TXXX:MusicBrainz Album Release Country'            'US'
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'TXXX:Q-HHRNBTT'                                    '1'
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'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:SCRIPT'                                       'Latn'
'TXXX:lastfmtags'                                   ['composers', 'instrumental', 'waltz', 'romantic', 'classical']
'TXXX:originalyear'                                 '1991'
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+1.69 dB'
'TXXX:replaygain_track_peak'                        '0.870667'
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                                            'path'  /data/Music/Bulk/00instruments-classical/The Top 100 Masterpieces of Classical Music 1685-1928/Disc 7 - 1854-1866/09 - 1858 J. Strauss II- Tritsch Tratsch Polka.mp3
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                                           'genre'  prerock-classical or classical instruments
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                                      'tag_artist'  Johann Strauss II
                                     'tag_release'  100 Masterpieces, Volume 7: The Top 10 of Classical Music 1854-1866
                                       'tag_title'  Tritsch-Tratsch Polka, Op. 214
                                             'bpm'  145.7
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                                    'tag_tracknum'  9
                                      'num_images'  1
                                             'key'  12B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-2', 'q-syn-1', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-2', 'q-grit-2']
                                      'lastfmtags'  ['composers', 'instrumental', 'waltz', 'romantic', 'classical']
                                        'tag_date'  1991
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561834.6567864  (2021-05-09 14:03:54)
                             'size'  4140759