======================== unified (from filesystem) ========================
                                         'bitrate'  '244.138'
                                        'duration'  '54'
                                          'artist'  'Ton Koopman'
                                     'text_people'  'Buxtehude'
                                         'release'  'Opera Omnia I - Buxtehude: Harpsichord works I'
                                           'title'  '46 Courant zimble for Harpsichord in A minor, BuxWV 245, Variation 1'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-2', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['baroque', 'bach', 'organ', 'classical', 'dietrich buxtehude']"
                                     'discogstags'  "['classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '2006'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '143.4'
                                             'key'  '1A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Opera Omnia I - Buxtehude: Harpsichord works I'
'TBPM' (BPM (beats per minute))                     '143.4'
'TCOM' (Composer)                                   'Buxtehude'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '2006'
'TIT2' (Title/songname/content description)         '46 Courant zimble for Harpsichord in A minor, BuxWV 245, Variation 1'
'TKEY' (Initial key)                                '1A'
'TPE1' (Lead performer(s)/Soloist(s))               'Ton Koopman'
'TPE2' (Band/orchestra/accompaniment)               'Ton Koopman'
'TPOS' (Part of a set)                              '1/2'
'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:discogstags'                                  'classical'
'TXXX:lastfmtags'                                   ['baroque', 'bach', 'organ', 'classical', 'dietrich buxtehude']
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '-0.04 dB'
'TXXX:replaygain_track_peak'                        '0.608756'

========================== row from database ==========================
                                              'id'  393303
                                            'path'  /data/Music/Bulk/00instruments-classical/Ton Koopman/Opera Omnia I - Buxtehude_ Harpsichord works I/46 Courant zimble for Harpsichord in A minor, BuxWV 245, Variation 1.mp3
                                         'working'  None
                                         'bitrate'  244
                                    'duration_sec'  54
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  1653723
                                           'mtime'  1620561853
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Buxtehude_ prerock classical classical instruments
                                      'tag_artist'  Ton Koopman
                                     'tag_release'  Opera Omnia I - Buxtehude: Harpsichord works I
                                       'tag_title'  46 Courant zimble for Harpsichord in A minor, BuxWV 245, Variation 1
                                             'bpm'  143.4
                                    'search_title'  '1':14 '245':11,12 '46':1 'a':7 'bux':15 'buxwv':10 'courant':2 'for':4 'harpsichord':5 'in':6 'minor':8,9 'variation':13 'wv':16 'zimble':3
                                   'search_artist'  'koopman':2 'ton':1
                                  'search_release'  'buxtehude':4,5 'harpsichord':6 'i':3 'omnia':2 'opera':1 'works':7
                                     'search_rest'  '00instruments':1 'buxtehude':3 'classical':2 'instruments':5 'prerock':4
                                    'search_combo'  '00instruments':26 '1':14A '245':11A,12A '46':1A 'a':7A 'bux':15A 'buxtehude':22C,23C,28 'buxwv':10A 'classical':27 'courant':2A 'for':4A 'harpsichord':5A,24C 'i':21C 'in':6A 'instruments':30 'koopman':18B 'minor':8A,9A 'omnia':20C 'opera':19C 'prerock':29 'ton':17B 'variation':13A 'works':25C 'wv':16A 'zimble':3A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  1A
                                           '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-3', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-2', 'q-grit-2']
                                      'lastfmtags'  ['baroque', 'bach', 'organ', 'classical', 'dietrich buxtehude']
                                        'tag_date'  2006
                                     'discogstags'  ['classical']

============================== file details ==============================
                                           'mtime'  1620561853.3948803  (2021-05-09 14:04:13)
                             'size'  1653723