======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '194'
                                          'artist'  'Teddy Wilson'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'April In My Heart (v - Billie Holiday + Benny Carter & Harry James)'
                                           'quals'  ("['Q-JZFKS-3', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', 'Q-OLDST-1', "
 "'q-syn-1', 'q-bass-2', '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'  "['piano', 'jazz', 'jazz piano', 'swing']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1938'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '103.695'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '103.695'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1938'
'TIT2' (Title/songname/content description)         'April In My Heart (v - Billie Holiday + Benny Carter & Harry James)'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'Teddy Wilson'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['piano', 'jazz', 'jazz piano', 'swing']
'TXXX:q-bass'                                       '2'
'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'                        '+2.14 dB'
'TXXX:replaygain_track_peak'                        '0.658871'

========================== row from database ==========================
                                              'id'  1442189
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1938/Teddy Wilson - April In My Heart (v - Billie Holiday + Benny Carter & Harry James) 9-11-1938.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  194
                                           'genre'  prerock-unsorted
                                        'filesize'  3901106
                                           'mtime'  1620386576
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1938 9 11 1938 prerock unsorted
                                      'tag_artist'  Teddy Wilson
                                     'tag_release'  None
                                       'tag_title'  April In My Heart (v - Billie Holiday + Benny Carter & Harry James)
                                             'bpm'  103.695
                                    'search_title'  'april':1 'benny':9 'billie':7 'carter':10 'harry':11 'heart':4 'holiday':8 'in':2 'james':12,13 'my':3 'v':5,6
                                   'search_artist'  'teddy':1 'wilson':2
                                  'search_release'  
                                     'search_rest'  '00oldiepop':5 '1938':6 '9':7 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':8 'unsorted':9
                                    'search_combo'  '00oldiepop':20 '1938':21 '9':22 'april':1A 'benny':9A 'billie':7A 'carter':10A 'country':19 'exotica':17 'harry':11A 'heart':4A 'holiday':8A 'in':2A 'james':12A,13A 'jazz':16 'my':3A 'oldies':18 'prerock':23 'teddy':14B 'unsorted':24 'v':5A,6A 'wilson':15B
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  8A
                                           '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-3', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-4', 'q-bass-2', 'q-grit-1']
                                      'lastfmtags'  ['piano', 'jazz', 'jazz piano', 'swing']
                                        'tag_date'  1938
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620386575.828726  (2021-05-07 13:22:55)
                             'size'  3901106