======================== unified (from filesystem) ========================
                                         'bitrate'  '140.101'
                                        'duration'  '170'
                                          'artist'  'Billy Holiday'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  "I'll never fail again"
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-2', 'Q-JZFKS-3', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'q-chart-4', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-2', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['jazz', 'blues', 'female vocalists', 'vocal jazz', 'billie holiday']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '15'
                                      'tracktotal'  '21'
                                            'date'  '1940'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-vocal'
                                             'bpm'  '143.112'
                                             'key'  '7A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '143.112'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-vocal'
'TDRC' (Recording time)                             '1940'
'TIT2' (Title/songname/content description)         "I'll never fail again"
'TKEY' (Initial key)                                '7A'
'TPE1' (Lead performer(s)/Soloist(s))               'Billy Holiday'
'TRCK' (Track number/Position in set)               '15/21'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['jazz', 'blues', 'female vocalists', 'vocal jazz', 'billie holiday']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '+1.76 dB'
'TXXX:replaygain_track_peak'                        '0.475781'

========================== row from database ==========================
                                              'id'  1498824
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Holiday, Billy/Collectors/Billy Holiday - I_ll Never Fail Again - 15.mp3
                                         'working'  None
                                         'bitrate'  140
                                    'duration_sec'  170
                                           'genre'  prerock-jb-jazz-vocal
                                        'filesize'  2992047
                                           'mtime'  1620530027
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country Holiday, Collectors I_ll Never Fail Again 15 prerock jb jazz vocal
                                      'tag_artist'  Billy Holiday
                                     'tag_release'  None
                                       'tag_title'  I'll never fail again
                                             'bpm'  143.112
                                    'search_title'  'again':6 'fail':5 'i':1 'ill':3 'll':2 'never':4
                                   'search_artist'  'billy':1 'holiday':2
                                  'search_release'  
                                     'search_rest'  'again':12 'collectors':7 'country':4 'exotica':2 'fail':11 'holiday':5,6 'i':8 'jazz':1 'jb':14 'll':9 'never':10 'oldies':3 'prerock':13 'vocal':15
                                    'search_combo'  'again':6A,20 'billy':7B 'collectors':15 'country':12 'exotica':10 'fail':5A,19 'holiday':8B,13,14 'i':1A,16 'ill':3A 'jazz':9 'jb':22 'll':2A,17 'never':4A,18 'oldies':11 'prerock':21 'vocal':23
                                    'tag_tracknum'  15
                                      'num_images'  0
                                             'key'  7A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-4', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['jazz', 'blues', 'female vocalists', 'vocal jazz', 'billie holiday']
                                        'tag_date'  1940
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620530026.9508748  (2021-05-09 05:13:46)
                             'size'  2992047