======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '161'
                                          'artist'  'Tony Martin'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Pretty Girl Is Like A Melody'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-2', 'Q-LOCALNESS-1', 'Q-JZFKS-2', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['black sabbath', 'heavy metal', 'rock', 'hard rock', '50s', 'classic rock']"
                                     'discogstags'  "['rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1946'
                                        'comments'  ''
                                           'genre'  'prerock-swing'
                                             'bpm'  '140.433'
                                             'key'  '10A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '140.433'
'TCON' (Content type, a.k.a. Genre)                 'prerock-swing'
'TDRC' (Recording time)                             '1946'
'TIT2' (Title/songname/content description)         'Pretty Girl Is Like A Melody'
'TKEY' (Initial key)                                '10A'
'TPE1' (Lead performer(s)/Soloist(s))               'Tony Martin'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '2'
'TXXX:discogstags'                                  'rock'
'TXXX:lastfmtags'                                   ['black sabbath', 'heavy metal', 'rock', 'hard rock', '50s', 'classic rock']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+3.03 dB'
'TXXX:replaygain_track_peak'                        '0.468450'

========================== row from database ==========================
                                              'id'  1430860
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1946/Tony Martin - Pretty Girl Is Like A Melody 1946.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  161
                                           'genre'  prerock-swing
                                        'filesize'  3244013
                                           'mtime'  1620562087
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1946 1946 prerock swing
                                      'tag_artist'  Tony Martin
                                     'tag_release'  None
                                       'tag_title'  Pretty Girl Is Like A Melody
                                             'bpm'  140.433
                                    'search_title'  'a':5 'girl':2 'is':3 'like':4 'melody':6 'pretty':1
                                   'search_artist'  'martin':2 'tony':1
                                  'search_release'  
                                     'search_rest'  '00oldiepop':5 '1946':6 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':7 'swing':8
                                    'search_combo'  '00oldiepop':13 '1946':14 'a':5A 'country':12 'exotica':10 'girl':2A 'is':3A 'jazz':9 'like':4A 'martin':8B 'melody':6A 'oldies':11 'prerock':15 'pretty':1A 'swing':16 'tony':7B
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  10A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-2', 'Q-JZFKS-2', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['black sabbath', 'heavy metal', 'rock', 'hard rock', '50s', 'classic rock']
                                        'tag_date'  1946
                                     'discogstags'  ['rock']

============================== file details ==============================
                                           'mtime'  1620562086.779866  (2021-05-09 14:08:06)
                             'size'  3244013