======================== unified (from filesystem) ========================
                                         'bitrate'  '247.608'
                                        'duration'  '54'
                                          'artist'  'Ton Koopman'
                                     'text_people'  'Buxtehude'
                                         'release'  'Opera Omnia I - Buxtehude: Harpsichord works I'
                                           'title'  '47 Variation 2'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', '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'  '143.5'
                                             'key'  '2A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Opera Omnia I - Buxtehude: Harpsichord works I'
'TBPM' (BPM (beats per minute))                     '143.5'
'TCOM' (Composer)                                   'Buxtehude'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '2006'
'TIT2' (Title/songname/content description)         '47 Variation 2'
'TKEY' (Initial key)                                '2A'
'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'                                       '1'
'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'                        '-0.39 dB'
'TXXX:replaygain_track_peak'                        '0.627299'

========================== row from database ==========================
                                              'id'  415192
                                            'path'  /data/Music/Bulk/00instruments-classical/Ton Koopman/Opera Omnia I - Buxtehude_ Harpsichord works I/47 Variation 2.mp3
                                         'working'  None
                                         'bitrate'  247
                                    'duration_sec'  54
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  1693308
                                           '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'  47 Variation 2
                                             'bpm'  143.5
                                    'search_title'  '2':3 '47':1 'variation':2
                                   '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':13 '2':3A '47':1A 'buxtehude':9C,10C,15 'classical':14 'harpsichord':11C 'i':8C 'instruments':17 'koopman':5B 'omnia':7C 'opera':6C 'prerock':16 'ton':4B 'variation':2A 'works':12C
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  2A
                                           '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-1', 'q-grit-2']
                                      'lastfmtags'  ['baroque', 'bach', 'organ', 'classical', 'dietrich buxtehude']
                                        'tag_date'  2006
                                     'discogstags'  ['classical']

============================== file details ==============================
                                           'mtime'  1620561853.443582  (2021-05-09 14:04:13)
                             'size'  1693308