======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '245'
                                          'artist'  'Wolfgang Amadeus Mozart'
                                     'text_people'  ''
                                         'release'  'Complete Mozart Edition Volume 41 CD 2'
                                           'title'  'Aria - Batti batti o bel Masetto'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
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 "'q-chart-3', 'q-drums-1', 'q-other-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['instrumental', 'composers', 'piano', 'classical', 'classic']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '6'
                                      'tracktotal'  ''
                                            'date'  '1990'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '144.438'
                                             'key'  '7B'
                                        'acoustid'  ''
rest: ''

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

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'COMM:iTunNORM:eng'                                 (' 0000017C 00000160 000013F5 00000F48 00027145 000186B7 00002CD3 00002FB2 '
 '000186A0 000186CE')
'TALB' (Album/Movie/Show title)                     'Complete Mozart Edition Volume 41 CD 2'
'TBPM' (BPM (beats per minute))                     '144.438'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1990'
'TIT2' (Title/songname/content description)         'Aria - Batti batti o bel Masetto'
'TKEY' (Initial key)                                '7B'
'TPE1' (Lead performer(s)/Soloist(s))               'Wolfgang Amadeus Mozart'
'TRCK' (Track number/Position in set)               '6'
'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'                                   ['instrumental', 'composers', 'piano', 'classical', 'classic']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+3.00 dB'
'TXXX:replaygain_track_peak'                        '0.658781'

========================== row from database ==========================
                                              'id'  1359938
                                            'path'  /data/Music/Bulk/00instruments-classical/Wolfgang Amadeus Mozart - Don Giovanni/cd 2/06 - Aria - Batti batti o bel Masetto.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  245
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  5900160
                                           'mtime'  1620561901
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Don Giovanni cd 06 prerock classical or classical instruments
                                      'tag_artist'  Wolfgang Amadeus Mozart
                                     'tag_release'  Complete Mozart Edition Volume 41 CD 2
                                       'tag_title'  Aria - Batti batti o bel Masetto
                                             'bpm'  144.438
                                    'search_title'  'aria':1 'batti':2 'bel':4 'masetto':5 'o':3
                                   'search_artist'  'amadeus':2 'mozart':3 'wolfgang':1
                                  'search_release'  '2':7 '41':5 'cd':6 'complete':1 'edition':3 'mozart':2 'volume':4
                                     'search_rest'  '00instruments':1 'cd':5 'classical':2 'don':3 'giovanni':4 'instruments':8 'or':7 'prerock':6
                                    'search_combo'  '00instruments':16 '2':15C '41':13C 'amadeus':7B 'aria':1A 'batti':2A 'bel':4A 'cd':14C,20 'classical':17 'complete':9C 'don':18 'edition':11C 'giovanni':19 'instruments':23 'masetto':5A 'mozart':8B,10C 'o':3A 'or':22 'prerock':21 'volume':12C 'wolfgang':6B
                                    'tag_tracknum'  6
                                      'num_images'  0
                                             'key'  7B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-2', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['instrumental', 'composers', 'piano', 'classical', 'classic']
                                        'tag_date'  1990
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561900.7310555  (2021-05-09 14:05:00)
                             'size'  5900160