======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '138'
                                          'artist'  'Schubert'
                                     'text_people'  ''
                                         'release'  'Schubert'
                                           'title'  'Allegro molto moderato in G ma'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'Q-PLAY-3', 'q-bass-1', 'q-busy-2', 'q-grit-2', "
 "'Q-PIANO-4', 'q-chart-3', 'q-drums-1', 'q-other-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['classical', 'romantic', 'piano', 'composers', 'instrumental']"
                                     'discogstags'  "['electronic']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '99.3'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Schubert'
'TBPM' (BPM (beats per minute))                     '99.3'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TIT2' (Title/songname/content description)         'Allegro molto moderato in G ma'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Schubert'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '4'
'TXXX:Q-PLAY'                                       '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'electronic'
'TXXX:lastfmtags'                                   ['classical', 'romantic', 'piano', 'composers', 'instrumental']
'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'                                      '1'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+2.10 dB'
'TXXX:replaygain_track_peak'                        '0.726603'

========================== row from database ==========================
                                              'id'  1213931
                                            'path'  /data/Music/Bulk/00instruments-classical/Schubert/Schubert - Allegro molto moderato in G major.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  138
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  2214118
                                           'mtime'  1620574225
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical major prerock classical or classical instruments
                                      'tag_artist'  Schubert
                                     'tag_release'  Schubert
                                       'tag_title'  Allegro molto moderato in G ma
                                             'bpm'  99.3
                                    'search_title'  'allegro':1 'g':5 'in':4 'ma':6 'moderato':3 'molto':2
                                   'search_artist'  'schubert':1
                                  'search_release'  'schubert':1
                                     'search_rest'  '00instruments':1 'classical':2 'instruments':6 'major':3 'or':5 'prerock':4
                                    'search_combo'  '00instruments':9 'allegro':1A 'classical':10 'g':5A 'in':4A 'instruments':14 'ma':6A 'major':11 'moderato':3A 'molto':2A 'or':13 'prerock':12 'schubert':7B,8C
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-4', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-1', 'Q-HAP-3', 'Q-PLAY-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['classical', 'romantic', 'piano', 'composers', 'instrumental']
                                        'tag_date'  
                                     'discogstags'  ['electronic']

============================== file details ==============================
                                           'mtime'  1620574225.3399768  (2021-05-09 17:30:25)
                             'size'  2214118