======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '147'
                                          'artist'  'Esther Walker'
                                     'text_people'  ''
                                         'release'  '[non-album tracks]'
                                           'title'  "Whatcha Gonna Do When There Ain't No Jazz"
                                           'quals'  ("['Q-JZFKS-3', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', 'Q-OLDST-1', "
 "'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-1', 'q-play-2', 'q-chart-1', "
 "'q-drums-1', 'q-other-2', 'q-piano-1', 'q-vocals-4', 'q-mixbeat-1']")
                                      'lastfmtags'  "['jazz', '30s', '20s', 'blues', 'all']"
                                     'discogstags'  "['pop']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1920'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '128.414'
                                             'key'  '12A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     '[non-album tracks]'
'TBPM' (BPM (beats per minute))                     '128.414'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1920'
'TIT2' (Title/songname/content description)         "Whatcha Gonna Do When There Ain't No Jazz"
'TKEY' (Initial key)                                '12A'
'TPE1' (Lead performer(s)/Soloist(s))               'Esther Walker'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'pop'
'TXXX:lastfmtags'                                   ['jazz', '30s', '20s', 'blues', 'all']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.52 dB'
'TXXX:replaygain_track_peak'                        '0.465495'

========================== row from database ==========================
                                              'id'  1505514
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1920/Esther Walker - Whatcha Gonna Do When There Ain_t No Jazz 12-5-1920.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  147
                                           'genre'  prerock-unsorted
                                        'filesize'  2950962
                                           'mtime'  1620385165
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1920 Ain_t 12 5 1920 prerock unsorted
                                      'tag_artist'  Esther Walker
                                     'tag_release'  [non-album tracks]
                                       'tag_title'  Whatcha Gonna Do When There Ain't No Jazz
                                             'bpm'  128.414
                                    'search_title'  'ain':6 'aint':8 'do':3 'gonna':2 'jazz':10 'no':9 't':7 'there':5 'whatcha':1 'when':4
                                   'search_artist'  'esther':1 'walker':2
                                  'search_release'  'album':2 'non':1 'nonalbum':3 'tracks':4,5
                                     'search_rest'  '00oldiepop':5 '1920':6 '5':9 'ain':7 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':10 't':8 'unsorted':11
                                    'search_combo'  '00oldiepop':22 '1920':23 '5':26 'ain':6A,24 'aint':8A 'album':14C 'country':21 'do':3A 'esther':11B 'exotica':19 'gonna':2A 'jazz':10A,18 'no':9A 'non':13C 'nonalbum':15C 'oldies':20 'prerock':27 't':7A,25 'there':5A 'tracks':16C,17C 'unsorted':28 'walker':12B 'whatcha':1A 'when':4A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  12A
                                           '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-3', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-2', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['jazz', '30s', '20s', 'blues', 'all']
                                        'tag_date'  1920
                                     'discogstags'  ['pop']

============================== file details ==============================
                                           'mtime'  1620385164.9044933  (2021-05-07 12:59:24)
                             'size'  2950962