======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '191'
                                          'artist'  'Lucky Millinder & His Orchestra & Trevor Bacon'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  ('173 Sweet slumber - Lucky Millinder & His Orchestra & Trevor Bacon '
 '(15-01-1944)')
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', '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-2', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '173'
                                      'tracktotal'  ''
                                            'date'  '1944'
                                        'comments'  ''
                                           'genre'  'prerock-swing'
                                             'bpm'  '117.398'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '117.398'
'TCON' (Content type, a.k.a. Genre)                 'prerock-swing'
'TDRC' (Recording time)                             '1944'
'TIT2' (Title/songname/content description)         ('173 Sweet slumber - Lucky Millinder & His Orchestra & Trevor Bacon '
 '(15-01-1944)')
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Lucky Millinder & His Orchestra & Trevor Bacon'
'TRCK' (Track number/Position in set)               '173'
'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:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'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'                        '+1.04 dB'
'TXXX:replaygain_track_peak'                        '0.301947'

========================== row from database ==========================
                                              'id'  1454922
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1943/173 Sweet slumber - Lucky Millinder & His Orchestra & Trevor Bacon (15-01-1944).mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  191
                                           'genre'  prerock-swing
                                        'filesize'  3075785
                                           'mtime'  1620561853
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1943 prerock swing
                                      'tag_artist'  Lucky Millinder & His Orchestra & Trevor Bacon
                                     'tag_release'  None
                                       'tag_title'  173 Sweet slumber - Lucky Millinder & His Orchestra & Trevor Bacon (15-01-1944)
                                             'bpm'  117.398
                                    'search_title'  '01':11 '15':10 '15011944':13 '173':1 '1944':12 'bacon':9 'his':6 'lucky':4 'millinder':5 'orchestra':7 'slumber':3 'sweet':2 'trevor':8
                                   'search_artist'  'bacon':6 'his':3 'lucky':1 'millinder':2 'orchestra':4 'trevor':5
                                  'search_release'  
                                     'search_rest'  '00oldiepop':5 '1943':6 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':7 'swing':8
                                    'search_combo'  '00oldiepop':24 '01':11A '15':10A '15011944':13A '173':1A '1943':25 '1944':12A 'bacon':9A,19B 'country':23 'exotica':21 'his':6A,16B 'jazz':20 'lucky':4A,14B 'millinder':5A,15B 'oldies':22 'orchestra':7A,17B 'prerock':26 'slumber':3A 'sweet':2A 'swing':27 'trevor':8A,18B
                                    'tag_tracknum'  173
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', '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-2', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  []
                                        'tag_date'  1944
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561853.1941843  (2021-05-09 14:04:13)
                             'size'  3075785