======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '187'
                                          'artist'  'Billy Cotton'
                                     'text_people'  ''
                                         'release'  'Rex  9634'
                                           'title'  "I'm Sending You The Siegfried Line (vocal - Alan Breeze)"
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-JZFKS-2', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-3', 'q-busy-2', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['jazz', '40s', 'wartime', 'swing']"
                                     'discogstags'  "['jazz']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1939'
                                        'comments'  ''
                                           'genre'  'prerock-swing'
                                             'bpm'  '114.673'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Rex  9634'
'TBPM' (BPM (beats per minute))                     '114.673'
'TCON' (Content type, a.k.a. Genre)                 'prerock-swing'
'TDRC' (Recording time)                             '1939'
'TIT2' (Title/songname/content description)         "I'm Sending You The Siegfried Line (vocal - Alan Breeze)"
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Billy Cotton'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'jazz'
'TXXX:lastfmtags'                                   ['jazz', '40s', 'wartime', 'swing']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'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'                                     '3'
'TXXX:replaygain_track_gain'                        '+0.81 dB'
'TXXX:replaygain_track_peak'                        '0.556230'

========================== row from database ==========================
                                              'id'  1505703
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1939/Billy Cotton - I_m Sending You The Siegfried Line (vocal - Alan Breeze) 15-9-1939.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  187
                                           'genre'  prerock-swing
                                        'filesize'  3753778
                                           'mtime'  1620561403
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1939 I_m 15 1939 prerock swing
                                      'tag_artist'  Billy Cotton
                                     'tag_release'  Rex  9634
                                       'tag_title'  I'm Sending You The Siegfried Line (vocal - Alan Breeze)
                                             'bpm'  114.673
                                    'search_title'  'alan':11 'breeze':12,13 'i':1 'im':3 'line':8 'm':2 'sending':4 'siegfried':7 'the':6 'vocal':9,10 'you':5
                                   'search_artist'  'billy':1 'cotton':2
                                  'search_release'  '9634':2 'rex':1
                                     'search_rest'  '00oldiepop':5 '1939':6 'country':4 'exotica':2 'i':7 'jazz':1 'm':8 'oldies':3 'prerock':9 'swing':10
                                    'search_combo'  '00oldiepop':22 '1939':23 '9634':17C 'alan':11A 'billy':14B 'breeze':12A,13A 'cotton':15B 'country':21 'exotica':19 'i':1A,24 'im':3A 'jazz':18 'line':8A 'm':2A,25 'oldies':20 'prerock':26 'rex':16C 'sending':4A 'siegfried':7A 'swing':27 'the':6A 'vocal':9A,10A 'you':5A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-4', 'Q-HAP-3', 'q-bass-3', 'q-grit-1']
                                      'lastfmtags'  ['jazz', '40s', 'wartime', 'swing']
                                        'tag_date'  1939
                                     'discogstags'  ['jazz']

============================== file details ==============================
                                           'mtime'  1620561402.8204103  (2021-05-09 13:56:42)
                             'size'  3753778