======================== unified (from filesystem) ========================
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                                        'duration'  '257'
                                          'artist'  'Music of the Jews from Morrocco'
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                                           'title'  'Ya Ribbon Alam'
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                             'musicbrainz_albumid'  ''
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                            'musicbrainz_artistid'  ''
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                                      'tracktotal'  ''
                                            'date'  '1970'
                                        'comments'  ''
                                           'genre'  'loc-m-israel'
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                                             'key'  '10A'
                                        'acoustid'  ''
rest: ''

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

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'TBPM' (BPM (beats per minute))                     '105.697'
'TCON' (Content type, a.k.a. Genre)                 'loc-m-israel'
'TDRC' (Recording time)                             '1970'
'TENC' (Encoded by)                                 'iTunes 10.1'
'TIT2' (Title/songname/content description)         'Ya Ribbon Alam'
'TKEY' (Initial key)                                '10A'
'TPE1' (Lead performer(s)/Soloist(s))               'Music of the Jews from Morrocco'
'TRCK' (Track number/Position in set)               '11'
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'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
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'TXXX:q-drums'                                      '1'
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========================== row from database ==========================
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                                    'duration_sec'  257
                                           'genre'  loc-m-israel
                                        'filesize'  6945967
                                           'mtime'  1620526467
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                                       'tag_title'  Ya Ribbon Alam
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                                    'tag_tracknum'  11
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                                             'key'  10A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-4', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-3', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  []
                                        'tag_date'  1970
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620526466.9821863  (2021-05-09 04:14:26)
                             'size'  6945967