======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '359'
                                          'artist'  'First English Public Jam Session'
                                     'text_people'  ''
                                         'release'  'HMV B-9250'
                                           'title'  'St Louis Blues'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-4', 'q-busy-2', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-2', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                     'discogstags'  "['jazz']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1941'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '118.497'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'HMV B-9250'
'TBPM' (BPM (beats per minute))                     '118.497'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1941'
'TIT2' (Title/songname/content description)         'St Louis Blues'
'TKEY' (Initial key)                                '9B'
'TPE1' (Lead performer(s)/Soloist(s))               'First English Public Jam Session'
'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'                                  'jazz'
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '2'
'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'                                     '1'
'TXXX:replaygain_track_gain'                        '+1.27 dB'
'TXXX:replaygain_track_peak'                        '0.549108'

========================== row from database ==========================
                                              'id'  1452817
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1941/First English Public Jam Session - St Louis Blues (W C Handy) 16-11-1941.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  359
                                           'genre'  prerock-unsorted
                                        'filesize'  7188274
                                           'mtime'  1621698040
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1941 (W C Handy) 16 11 1941 prerock unsorted
                                      'tag_artist'  First English Public Jam Session
                                     'tag_release'  HMV B-9250
                                       'tag_title'  St Louis Blues
                                             'bpm'  118.497
                                    'search_title'  'blues':3 'louis':2 'st':1
                                   'search_artist'  'english':2 'first':1 'jam':4 'public':3 'session':5
                                  'search_release'  '9250':3 'b':2 'b9250':4 'hmv':1
                                     'search_rest'  '00oldiepop':5 '1941':6 'c':9 'country':4 'exotica':2 'handy':10,11 'jazz':1 'oldies':3 'prerock':12 'unsorted':13 'w':7,8
                                    'search_combo'  '00oldiepop':17 '1941':18 '9250':11C 'b':10C 'b9250':12C 'blues':3A 'c':21 'country':16 'english':5B 'exotica':14 'first':4B 'handy':22,23 'hmv':9C 'jam':7B 'jazz':13 'louis':2A 'oldies':15 'prerock':24 'public':6B 'session':8B 'st':1A 'unsorted':25 'w':19,20
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9B
                                           '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-2', 'q-drums-2', 'q-syn-1', 'q-chart-1', 'q-other-4', 'Q-HAP-3', 'q-bass-4', 'q-grit-1']
                                      'lastfmtags'  []
                                        'tag_date'  1941
                                     'discogstags'  ['jazz']

============================== file details ==============================
                                           'mtime'  1621698040.1783395  (2021-05-22 17:40:40)
                             'size'  7188274