======================== unified (from filesystem) ========================
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                                          'artist'  'Ludwig Van Beethoven'
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                                      'lastfmtags'  "['instrumental', 'composers', 'romantic', 'classical', 'classic']"
                                     'discogstags'  "['classical']"
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                            'musicbrainz_artistid'  ''
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                                      'tracktotal'  ''
                                            'date'  '1994'
                                        'comments'  ''
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                                        'acoustid'  ''
rest: ''

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

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'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1994'
'TIT2' (Title/songname/content description)         'Beethoven-Pathetique Op. 13 No'
'TKEY' (Initial key)                                '5A'
'TPE1' (Lead performer(s)/Soloist(s))               'Ludwig Van Beethoven'
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'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '4'
'TXXX:Q-PLAY'                                       '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'classical'
'TXXX:lastfmtags'                                   ['instrumental', 'composers', 'romantic', 'classical', 'classic']
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'TXXX:q-busy'                                       '3'
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'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '1'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
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'TXXX:replaygain_track_peak'                        '0.787060'

========================== row from database ==========================
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                                            'path'  /data/Music/Bulk/00instruments-classical/Beethoven/The Famous Piano Sonatas/07 - Beethoven-Pathetique Op. 13 No.8 C _ Moll, 1. Grave_ Allegro di molto.mp3
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                                    'duration_sec'  497
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  11933592
                                           'mtime'  1620574134
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                                     'tag_release'  The Famous Piano Sonatas
                                       'tag_title'  Beethoven-Pathetique Op. 13 No
                                             'bpm'  112.134
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                                   'search_artist'  'beethoven':3 'ludwig':1 'van':2
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                                    'tag_tracknum'  7
                                      'num_images'  0
                                             'key'  5A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-4', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-1', 'Q-HAP-3', 'Q-PLAY-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['instrumental', 'composers', 'romantic', 'classical', 'classic']
                                        'tag_date'  1994
                                     'discogstags'  ['classical']

============================== file details ==============================
                                           'mtime'  1620574134.2337816  (2021-05-09 17:28:54)
                             'size'  11933592