======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '175'
                                          'artist'  'Duke Ellington & His Famous Orchestra'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  "069 The the 'A'Train - Duke Ellington & His Famous Orchestra (3-07-1943)"
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-2', 'q-busy-3', 'q-grit-1', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-2', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['jazz', 'swing', 'big band', 'piano', 'blues']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '69'
                                      'tracktotal'  ''
                                            'date'  '1943'
                                        'comments'  ''
                                           'genre'  'prerock-band'
                                             'bpm'  '84.738'
                                             'key'  '8B'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '84.738'
'TCON' (Content type, a.k.a. Genre)                 'prerock-band'
'TDRC' (Recording time)                             '1943'
'TIT2' (Title/songname/content description)         "069 The the 'A'Train - Duke Ellington & His Famous Orchestra (3-07-1943)"
'TKEY' (Initial key)                                '8B'
'TPE1' (Lead performer(s)/Soloist(s))               'Duke Ellington & His Famous Orchestra'
'TRCK' (Track number/Position in set)               '69'
'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'                                   ['jazz', 'swing', 'big band', 'piano', 'blues']
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '-0.17 dB'
'TXXX:replaygain_track_peak'                        '0.350619'

========================== row from database ==========================
                                              'id'  1498124
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1943/069 The the _A_Train - Duke Ellington & His Famous Orchestra (3-07-1943).mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  175
                                           'genre'  prerock-band
                                        'filesize'  2812052
                                           'mtime'  1620561049
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop _A_Train prerock band
                                      'tag_artist'  Duke Ellington & His Famous Orchestra
                                     'tag_release'  None
                                       'tag_title'  069 The the 'A'Train - Duke Ellington & His Famous Orchestra (3-07-1943)
                                             'bpm'  84.738
                                    'search_title'  '07':11 '1943':12 '3':10 '3071943':13 'a':2 'atrain':4 'duke':5 'ellington':6 'famous':8 'his':7 'orchestra':9 'the':1 'train':3
                                   'search_artist'  'duke':1 'ellington':2 'famous':4 'his':3 'orchestra':5
                                  'search_release'  
                                     'search_rest'  '00oldiepop':5 'a':6 'band':9 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':8 'train':7
                                    'search_combo'  '00oldiepop':23 '07':11A '1943':12A '3':10A '3071943':13A 'a':2A,24 'atrain':4A 'band':27 'country':22 'duke':5A,14B 'ellington':6A,15B 'exotica':20 'famous':8A,17B 'his':7A,16B 'jazz':19 'oldies':21 'orchestra':9A,18B 'prerock':26 'the':1A 'train':3A,25
                                    'tag_tracknum'  69
                                      'num_images'  0
                                             'key'  8B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', '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-1']
                                      'lastfmtags'  ['jazz', 'swing', 'big band', 'piano', 'blues']
                                        'tag_date'  1943
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561049.237739  (2021-05-09 13:50:49)
                             'size'  2812052