======================== unified (from filesystem) ========================
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                                        'duration'  '938'
                                          'artist'  'George Szell, Cleveland Orchestra'
                                     'text_people'  'Beethoven, Ludwig van'
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                                           'title'  'Symphony #3 in E-flat major, Op.55 "Eroica" - 2nd Movement'
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                                      'lastfmtags'  "['soundtrack', 'szell', 'conductor', 'classical']"
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                            'musicbrainz_artistid'  ''
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                                      'tracktotal'  '7'
                                            'date'  '1957'
                                        'comments'  ''
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                                             'bpm'  '140.3'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

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'TCOM' (Composer)                                   'Beethoven, Ludwig van'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1957'
'TENC' (Encoded by)                                 'iTunes v7.0.2.16'
'TIT2' (Title/songname/content description)         'Symphony #3 in E-flat major, Op.55 "Eroica" - 2nd Movement'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'George Szell, Cleveland Orchestra'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '4/8'
'TRCK' (Track number/Position in set)               '2/7'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['soundtrack', 'szell', 'conductor', 'classical']
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========================== row from database ==========================
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                                            'path'  /data/Music/Bulk/00instruments-classical/Compilations/Nodame Cantabile Best100/4-02 Symphony #3 in E-flat major, Op.55 _Eroica_ - 2nd Movement.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  938
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  22564591
                                           'mtime'  1620561512
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                                     'tag_release'  Nodame Cantabile Best100
                                       'tag_title'  Symphony #3 in E-flat major, Op.55 "Eroica" - 2nd Movement
                                             'bpm'  140.3
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                                   'search_artist'  'cleveland':4 'george':1 'orchestra':5 'szell':2,3
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                                    'tag_tracknum'  2
                                      'num_images'  1
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-2', 'q-syn-1', 'q-chart-3', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['soundtrack', 'szell', 'conductor', 'classical']
                                        'tag_date'  1957
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561511.649504  (2021-05-09 13:58:31)
                             'size'  22564591