======================== unified (from filesystem) ========================
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                                       'tag_title'  Black Hearted Queen
                                             'bpm'  144.2
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                                   'search_artist'  'niblett':2 'scout':1
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                                      'lastfmtags'  ['indie', 'female vocalists', 'indie rock', 'folk', 'singer songwriter']
                                        'tag_date'  2007
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============================== file details ==============================
                                           'mtime'  1621697539.9569354  (2021-05-22 17:32:19)
                             'size'  6851528