======================== unified (from filesystem) ========================
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                                        'duration'  '194'
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                                           'title'  'South of the Border'
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                                      'tracktotal'  '20'
                                            'date'  '1951'
                                        'comments'  ''
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rest: ''

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

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'TDRC' (Recording time)                             '1951'
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'TIT2' (Title/songname/content description)         'South of the Border'
'TKEY' (Initial key)                                '7A'
'TPE1' (Lead performer(s)/Soloist(s))               'Gene Autry'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '20/20'
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'TXXX:lastfmtags'                                   ['classic country',
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                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Vol 20/04. Gene Autry - South of the Border.mp3
                                         'working'  None
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                                    'duration_sec'  194
                                           'genre'  loc-namerica-country
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                                           'mtime'  1621628460
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                                             'bpm'  114.9
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                                        'tag_date'  1951
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621628460.1067455  (2021-05-21 22:21:00)
                             'size'  1555834