======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '182'
                                          'artist'  'Al Jolson'
                                     'text_people'  ''
                                         'release'  'Brunswick  2650'
                                           'title'  'Who Wants A Bad Little Boy'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['20s', 'oldies', 'music hall', 'male vocalists', 'jazz', 'vaudeville']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1924'
                                        'comments'  ''
                                           'genre'  'prerock-vocal'
                                             'bpm'  '84.175'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Brunswick  2650'
'TBPM' (BPM (beats per minute))                     '84.175'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal'
'TDRC' (Recording time)                             '1924'
'TIT2' (Title/songname/content description)         'Who Wants A Bad Little Boy'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'Al Jolson'
'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'                                   ['20s', 'oldies', 'music hall', 'male vocalists', 'jazz', 'vaudeville']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'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'                        '+2.20 dB'
'TXXX:replaygain_track_peak'                        '0.561804'

========================== row from database ==========================
                                              'id'  1435645
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1924/Al Jolson - Who Wants A Bad Little Boy -6-1924.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  182
                                           'genre'  prerock-vocal
                                        'filesize'  3655474
                                           'mtime'  1620666395
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1924 1924 prerock vocal
                                      'tag_artist'  Al Jolson
                                     'tag_release'  Brunswick  2650
                                       'tag_title'  Who Wants A Bad Little Boy
                                             'bpm'  84.175
                                    'search_title'  'a':3 'bad':4 'boy':6 'little':5 'wants':2 'who':1
                                   'search_artist'  'al':1 'jolson':2
                                  'search_release'  '2650':2 'brunswick':1
                                     'search_rest'  '00oldiepop':5 '1924':6 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':7 'vocal':8
                                    'search_combo'  '00oldiepop':15 '1924':16 '2650':10C 'a':3A 'al':7B 'bad':4A 'boy':6A 'brunswick':9C 'country':14 'exotica':12 'jazz':11 'jolson':8B 'little':5A 'oldies':13 'prerock':17 'vocal':18 'wants':2A 'who':1A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  8A
                                           '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-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['20s', 'oldies', 'music hall', 'male vocalists', 'jazz', 'vaudeville']
                                        'tag_date'  1924
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620666395.2524614  (2021-05-10 19:06:35)
                             'size'  3655474