======================== unified (from filesystem) ========================
                                         'bitrate'  '135.955'
                                        'duration'  '187'
                                          'artist'  'Billy Holiday'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  "Billie's blues"
                                           '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-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['jazz', 'blues', 'female vocalists', 'vocal jazz', 'billie holiday']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '6'
                                      'tracktotal'  '2'
                                            'date'  '1940'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-vocal'
                                             'bpm'  '145.895'
                                             'key'  '4B'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '145.895'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-vocal'
'TDRC' (Recording time)                             '1940'
'TIT2' (Title/songname/content description)         "Billie's blues"
'TKEY' (Initial key)                                '4B'
'TPE1' (Lead performer(s)/Soloist(s))               'Billy Holiday'
'TRCK' (Track number/Position in set)               '6/2'
'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'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.07 dB'
'TXXX:replaygain_track_peak'                        '0.566023'

========================== row from database ==========================
                                              'id'  1509499
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Holiday, Billy/Collectors/Billy Holiday - Billie_s Blues - 06.mp3
                                         'working'  None
                                         'bitrate'  136
                                    'duration_sec'  187
                                           'genre'  prerock-jb-jazz-vocal
                                        'filesize'  3186688
                                           'mtime'  1620530019
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country Holiday, Collectors Billie_s Blues 06 prerock jb jazz vocal
                                      'tag_artist'  Billy Holiday
                                     'tag_release'  None
                                       'tag_title'  Billie's blues
                                             'bpm'  145.895
                                    'search_title'  'billie':1 'billies':3 'blues':4 's':2
                                   'search_artist'  'billy':1 'holiday':2
                                  'search_release'  
                                     'search_rest'  'billie':8 'blues':10 'collectors':7 'country':4 'exotica':2 'holiday':5,6 'jazz':1 'jb':12 'oldies':3 'prerock':11 's':9 'vocal':13
                                    'search_combo'  'billie':1A,14 'billies':3A 'billy':5B 'blues':4A,16 'collectors':13 'country':10 'exotica':8 'holiday':6B,11,12 'jazz':7 'jb':18 'oldies':9 'prerock':17 's':2A,15 'vocal':19
                                    'tag_tracknum'  6
                                      'num_images'  0
                                             'key'  4B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', '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-2', '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'  1620530019.28951  (2021-05-09 05:13:39)
                             'size'  3186688