======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '145'
                                          'artist'  'Glenn Gould'
                                     'text_people'  'Mozart, Wolfgang Amadeus'
                                         'release'  'Nodame Cantabile Best100'
                                           'title'  'Piano Sonata #8 in A minor, K.310(300d) - 3rd Movement'
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                                      'lastfmtags'  "['piano', 'bach', 'baroque', 'classical', 'canadian']"
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                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '7'
                                      'tracktotal'  '7'
                                            'date'  '1969'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '124.5'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

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'COMM:iTunNORM:eng'                                 (' 000000EB 000001CC 000008DC 00000DA9 000098DB 00021782 00003B33 000043FD '
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'TALB' (Album/Movie/Show title)                     'Nodame Cantabile Best100'
'TBPM' (BPM (beats per minute))                     '124.5'
'TCOM' (Composer)                                   'Mozart, Wolfgang Amadeus'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1969'
'TENC' (Encoded by)                                 'iTunes v7.0.2.16'
'TIT2' (Title/songname/content description)         'Piano Sonata #8 in A minor, K.310(300d) - 3rd Movement'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Glenn Gould'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '4/8'
'TRCK' (Track number/Position in set)               '7/7'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'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:lastfmtags'                                   ['piano', 'bach', 'baroque', 'classical', 'canadian']
'TXXX:q-bass'                                       '1'
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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'
'TXXX:replaygain_track_gain'                        '+0.37 dB'
'TXXX:replaygain_track_peak'                        '0.629958'

========================== row from database ==========================
                                              'id'  447451
                                            'path'  /data/Music/Bulk/00instruments-classical/Compilations/Nodame Cantabile Best100/4-07 Piano Sonata #8 in A minor, K.310(300d) - 3rd Movement.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  145
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  3535700
                                           'mtime'  1620574146
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                                        'rest_str'   00instruments classical Compilations 4 07 prerock classical classical instruments
                                      'tag_artist'  Glenn Gould
                                     'tag_release'  Nodame Cantabile Best100
                                       'tag_title'  Piano Sonata #8 in A minor, K.310(300d) - 3rd Movement
                                             'bpm'  124.5
                                    'search_title'  '300d':11 '310':10 '3rd':13 '8':3,4 'a':6 'in':5 'k':9 'k310300d':12 'minor':7,8 'movement':14 'piano':1 'sonata':2
                                   'search_artist'  'glenn':1 'gould':2
                                  'search_release'  'best100':3 'cantabile':2 'nodame':1
                                     'search_rest'  '00instruments':1 '4':4 'classical':2 'compilations':3 'instruments':6 'prerock':5
                                    'search_combo'  '00instruments':20 '300d':11A '310':10A '3rd':13A '4':23 '8':3A,4A 'a':6A 'best100':19C 'cantabile':18C 'classical':21 'compilations':22 'glenn':15B 'gould':16B 'in':5A 'instruments':25 'k':9A 'k310300d':12A 'minor':7A,8A 'movement':14A 'nodame':17C 'piano':1A 'prerock':24 'sonata':2A
                                    'tag_tracknum'  7
                                      'num_images'  1
                                             'key'  9A
                                           '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-2', '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'  ['piano', 'bach', 'baroque', 'classical', 'canadian']
                                        'tag_date'  1969
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620574146.364957  (2021-05-09 17:29:06)
                             'size'  3535700