======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '200'
                                          'artist'  'Six Brown Brothers '
                                     'text_people'  ''
                                         'release'  '(Saxo Sextette)'
                                           'title'  'All Blues Medley 1917'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-2', 'Q-UNU-1', 'Q-JZFKS-2', '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-4', 'q-piano-1', 'q-vocals-2', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['acid house', 'jazz', 'all', 'ragtime', 'house']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '00'
                                      'tracktotal'  ''
                                            'date'  '1917'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-unsorted'
                                             'bpm'  '116.9'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

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

'COMM:MusicMatch_Bio:\x00\x00\x00'                  'Sound changed by Breda4@hotmail.com '
'COMM:MusicMatch_Tempo:\x00\x00\x00'                'None'
'TALB' (Album/Movie/Show title)                     '(Saxo Sextette)'
'TBPM' (BPM (beats per minute))                     '116.9'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-unsorted'
'TDRC' (Recording time)                             '1917'
'TIT2' (Title/songname/content description)         'All Blues Medley 1917'
'TKEY' (Initial key)                                '9B'
'TLEN' (Length)                                     '200000'
'TPE1' (Lead performer(s)/Soloist(s))               'Six Brown Brothers '
'TRCK' (Track number/Position in set)               '00'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['acid house', 'jazz', 'all', 'ragtime', 'house']
'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'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '+0.14 dB'
'TXXX:replaygain_track_peak'                        '0.711564'

========================== row from database ==========================
                                              'id'  512142
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1917 - Saxo Sextette - All Blues Medley.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  200
                                           'genre'  prerock-jb-jazz-unsorted
                                        'filesize'  4019060
                                           'mtime'  1620539138
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] prerock jb jazz unsorted
                                      'tag_artist'  Six Brown Brothers 
                                     'tag_release'  (Saxo Sextette)
                                       'tag_title'  All Blues Medley 1917
                                             'bpm'  116.9
                                    'search_title'  '1917':4 'all':1 'blues':2 'medley':3
                                   'search_artist'  'brothers':3 'brown':2 'six':1
                                  'search_release'  'saxo':1,2 'sextette':3,4
                                     'search_rest'  '1878':11 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'jazz':22 'jb':21 'old':7 'prerock':20 'recordings':8,9,10 'unsorted':23 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':22 '1917':4A '1920':23 '32k':25,27,29 'all':1A 'blues':2A 'brothers':7B 'brown':6B 'cylinder':13,15 'cylindervery':17 'jazz':33 'jb':32 'medley':3A 'old':18 'prerock':31 'recordings':19,20,21 'saxo':8C,9C 'sextette':10C,11C 'six':5B 'unsorted':34 'very':14,16 'wax':12 'wma':24,26,28 'wma32k':30
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['acid house', 'jazz', 'all', 'ragtime', 'house']
                                        'tag_date'  1917
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620539138.1482155  (2021-05-09 07:45:38)
                             'size'  4019060