======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '264'
                                          'artist'  'a-ha'
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                                      'lastfmtags'  "['80s', 'new wave', 'synth pop', 'pop', 'norwegian']"
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                            'musicbrainz_artistid'  ''
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                                      'tracktotal'  '16'
                                            'date'  '1996'
                                        'comments'  ''
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'TDOR' (Original release time)                      '1991'
'TDRC' (Recording time)                             '1996'
'TIT2' (Title/songname/content description)         'Crying in the Rain'
'TKEY' (Initial key)                                '10B'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'a-ha'
'TPE2' (Band/orchestra/accompaniment)               'a-ha'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'wea'
'TRCK' (Track number/Position in set)               '12/16'
'TSO2'                                              'a-ha'
'TSOP' (Performer sort order)                       'a-ha'
'TSRC' (ISRC (international standard recording code))  'USWB10403941'
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                                    'duration_sec'  264
                                           'genre'  electronic-we-new wave or post punk
                                        'filesize'  4235762
                                           'mtime'  1620611110
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                                      'tag_artist'  a-ha
                                     'tag_release'  Headlines and Deadlines: The Hits of a-ha
                                       'tag_title'  Crying in the Rain
                                             'bpm'  90.858
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                                    'tag_tracknum'  12
                                      'num_images'  0
                                             'key'  10B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-2', 'q-syn-2', 'q-chart-4', 'q-other-3', 'Q-HAP-2', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['80s', 'new wave', 'synth pop', 'pop', 'norwegian']
                                        'tag_date'  1996
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620611110.376295  (2021-05-10 03:45:10)
                             'size'  4235762