======================== unified (from filesystem) ========================
                                         'bitrate'  '148.377'
                                        'duration'  '541'
                                          'artist'  'Witold Lutoslawski'
                                     'text_people'  ''
                                         'release'  'Lutoslawski and Ligeti and Schnittke:  String Quartets'
                                           'title'  'Introductory movement'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'q-chart-3', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-2', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['contemporary classical', 'classical', 'polish', 'avant-garde', 'composer']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '2'
                                      'tracktotal'  '4'
                                            'date'  '1989'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '141.7'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'COMM:CDDB Disc ID:XXX'                             '290C9D04'
'TALB' (Album/Movie/Show title)                     'Lutoslawski and Ligeti and Schnittke:  String Quartets'
'TBPM' (BPM (beats per minute))                     '141.7'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1989'
'TIT2' (Title/songname/content description)         'Introductory movement'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'Witold Lutoslawski'
'TRCK' (Track number/Position in set)               '2/4'
'TSSE' (Software/Hardware and settings used for encoding)  'Audiograbber 1.80, LAME dll 3.92, VBR 3, Stereo, High quality'
'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', 'polish', 'avant-garde', 'composer']
'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'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '+4.84 dB'
'TXXX:replaygain_track_peak'                        '0.998388'

========================== row from database ==========================
                                              'id'  1214332
                                            'path'  /data/Music/Bulk/00instruments-classical/Lutoslawski and Ligeti and Schnittke-  String Quartets/Witold Lutoslawski - String Quartet - I - 02 - Introductory movement.mp3
                                         'working'  None
                                         'bitrate'  148
                                    'duration_sec'  541
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  10038299
                                           'mtime'  1620561638
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical 02 prerock classical classical instruments
                                      'tag_artist'  Witold Lutoslawski
                                     'tag_release'  Lutoslawski and Ligeti and Schnittke:  String Quartets
                                       'tag_title'  Introductory movement
                                             'bpm'  141.7
                                    'search_title'  'introductory':1 'movement':2
                                   'search_artist'  'lutoslawski':2 'witold':1
                                  'search_release'  'and':2 'ligeti':3 'lutoslawski':1 'quartets':7 'schnittke':4,5 'string':6
                                     'search_rest'  '00instruments':1 'classical':2 'instruments':4 'prerock':3
                                    'search_combo'  '00instruments':12 'and':6C 'classical':13 'instruments':15 'introductory':1A 'ligeti':7C 'lutoslawski':4B,5C 'movement':2A 'prerock':14 'quartets':11C 'schnittke':8C,9C 'string':10C 'witold':3B
                                    'tag_tracknum'  2
                                      'num_images'  0
                                             'key'  8A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', '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-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['contemporary classical', 'classical', 'polish', 'avant-garde', 'composer']
                                        'tag_date'  1989
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561637.6403692  (2021-05-09 14:00:37)
                             'size'  10038299