======================== unified (from filesystem) ========================
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                            'musicbrainz_artistid'  ''
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                                      'tracktotal'  '13'
                                            'date'  '2003'
                                        'comments'  ''
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======================== rawer (from filesystem) ========================

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'TCON' (Content type, a.k.a. Genre)                 'ifs-songwriter'
'TDRC' (Recording time)                             '2003'
'TIT2' (Title/songname/content description)         "You Don't Have to Be a Scientist to Do Experiments on Your Own Heart"
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Jeffrey Lewis'
'TRCK' (Track number/Position in set)               '13/13'
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'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'rock'
'TXXX:lastfmtags'                                   ['indie', 'lo fi', 'antifolk', 'anti folk', 'singer songwriter']
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'TXXX:q-drums'                                      '1'
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'TXXX:q-piano'                                      '1'
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'TXXX:replaygain_track_peak'                        '0.621861'

========================== row from database ==========================
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                                            'path'  /data/Music/Bulk/00singer-songwriter-eos/Jeffrey Lewis/It_s The Ones Who_ve Cracked That The Light Shines Through/13 - Jeffrey Lewis - You Don_t Have to Be a Scientist to Do Experiments on Your Own Heart.mp3
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                                           'mtime'  1637249133
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                                      'tag_artist'  Jeffrey Lewis
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                                       'tag_title'  You Don't Have to Be a Scientist to Do Experiments on Your Own Heart
                                             'bpm'  120.0
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                                    'tag_tracknum'  13
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-2', 'q-other-3', 'Q-HAP-2', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['indie', 'lo fi', 'antifolk', 'anti folk', 'singer songwriter']
                                        'tag_date'  2003
                                     'discogstags'  ['rock']

============================== file details ==============================
                                           'mtime'  1637249132.5708733  (2021-11-18 16:25:32)
                             'size'  4617371