======================== unified (from filesystem) ========================
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                                        'duration'  '162'
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                                      'lastfmtags'  "['classic country', 'country', 'hillbilly', 'western swing']"
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                            'musicbrainz_artistid'  ''
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                                      'tracktotal'  '20'
                                            'date'  '1946'
                                        'comments'  ''
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======================== rawer (from filesystem) ========================

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'TDRC' (Recording time)                             '1946'
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'TIT2' (Title/songname/content description)         'Get Yourself a Red Head'
'TKEY' (Initial key)                                '5B'
'TPE1' (Lead performer(s)/Soloist(s))               'Hank Penny'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '11/20'
'TRCK' (Track number/Position in set)               '14/20'
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'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '2'
'TXXX:lastfmtags'                                   ['classic country', 'country', 'hillbilly', 'western swing']
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'TXXX:q-drums'                                      '1'
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                                    'duration_sec'  162
                                           'genre'  loc-namerica-country
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                                             'bpm'  114.2
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                                   'search_artist'  'hank':1 'penny':2
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                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['classic country', 'country', 'hillbilly', 'western swing']
                                        'tag_date'  1946
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621628454.8352206  (2021-05-21 22:20:54)
                             'size'  1300028