======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '522'
                                          'artist'  'Gorecki'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Symphony of Sorrowful Songs'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'q-syn-1', 'q-bass-1', "
 "'q-busy-2', 'q-grit-2', 'q-play-3', 'Q-OLDST-1', 'q-chart-3', 'q-drums-1', "
 "'q-other-3', 'q-piano-1', 'q-vocals-4', 'Q-HHRNBTT-1', 'q-mixbeat-1']")
                                      'lastfmtags'  ("['contemporary classical', 'classical', 'minimalism', 'polish', '20th "
 "century classical']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '01'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '139.2'
                                             'key'  '2B'
                                        'acoustid'  ''
rest: ''

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

'COMM:MusicMatch_Situation:en\x00'                  'None'
'COMM:MusicMatch_Tempo:en\x00'                      'None'
'TBPM' (BPM (beats per minute))                     '139.2'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TIT2' (Title/songname/content description)         'Symphony of Sorrowful Songs'
'TKEY' (Initial key)                                '2B'
'TLEN' (Length)                                     '522736'
'TMED' (Media type)                                 'DIG'
'TPE1' (Lead performer(s)/Soloist(s))               'Gorecki'
'TRCK' (Track number/Position in set)               '01'
'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'                                   ['contemporary classical',
 'classical',
 'minimalism',
 'polish',
 '20th century classical']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.41 dB'
'TXXX:replaygain_track_peak'                        '0.907507'

========================== row from database ==========================
                                              'id'  1475929
                                            'path'  /data/Music/Bulk/00instruments-classical/Henryk Gorecki_Symphony of Sorrowful Songs.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  522
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  8365952
                                           'mtime'  1620561583
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Henryk Gorecki_Symphony prerock classical classical instruments
                                      'tag_artist'  Gorecki
                                     'tag_release'  None
                                       'tag_title'  Symphony of Sorrowful Songs
                                             'bpm'  139.2
                                    'search_title'  'of':2 'songs':4 'sorrowful':3 'symphony':1
                                   'search_artist'  'gorecki':1
                                  'search_release'  
                                     'search_rest'  '00instruments':1 'classical':2 'gorecki':4 'henryk':3 'instruments':7 'prerock':6 'symphony':5
                                    'search_combo'  '00instruments':6 'classical':7 'gorecki':5B,9 'henryk':8 'instruments':12 'of':2A 'prerock':11 'songs':4A 'sorrowful':3A 'symphony':1A,10
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  2B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['contemporary classical', 'classical', 'minimalism', 'polish', '20th century classical']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561582.7284143  (2021-05-09 13:59:42)
                             'size'  8365952