======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '112'
                                          'artist'  "Charles Prince's Band"
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Creole Belles 1902'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-2', '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-2', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1902'
                                        'comments'  ''
                                           'genre'  'prerock-band'
                                             'bpm'  '112.7'
                                             'key'  '12B'
                                        'acoustid'  ''
rest: ''

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

'COMM:MusicMatch_Bio:\x00\x00\x00'                  'Sound changed by Breda4@hotmail.com '
'COMM:MusicMatch_Tempo:\x00\x00\x00'                'None'
'PRIV:WM/MediaClassPrimaryID:¼}`Ñ#ãâK\x86¡H¤*(D\x1e'  PRIV(owner='WM/MediaClassPrimaryID', data=b'\xbc}`\xd1#\xe3\xe2K\x86\xa1H\xa4*(D\x1e')
'PRIV:WM/MediaClassSecondaryID:\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'  PRIV(owner='WM/MediaClassSecondaryID', data=b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
'TBPM' (BPM (beats per minute))                     '112.7'
'TCON' (Content type, a.k.a. Genre)                 'prerock-band'
'TDRC' (Recording time)                             '1902'
'TIT2' (Title/songname/content description)         'Creole Belles 1902'
'TKEY' (Initial key)                                '12B'
'TPE1' (Lead performer(s)/Soloist(s))               "Charles Prince's Band"
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'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'                                     '3'
'TXXX:replaygain_track_gain'                        '+0.31 dB'
'TXXX:replaygain_track_peak'                        '0.466018'

========================== row from database ==========================
                                              'id'  511647
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1902 - Charles Prince - Creole Belles.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  112
                                           'genre'  prerock-band
                                        'filesize'  2256301
                                           'mtime'  1620561439
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] prerock band
                                      'tag_artist'  Charles Prince's Band
                                     'tag_release'  None
                                       'tag_title'  Creole Belles 1902
                                             'bpm'  112.7
                                    'search_title'  '1902':3 'belles':2 'creole':1
                                   'search_artist'  'band':5 'charles':1 'prince':2 'princes':4 's':3
                                  'search_release'  
                                     'search_rest'  '1878':11 '1920':12 '32k':14,16,18 'band':21 'cylinder':2,4 'cylindervery':6 'old':7 'prerock':20 'recordings':8,9,10 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':19 '1902':3A '1920':20 '32k':22,24,26 'band':8B,29 'belles':2A 'charles':4B 'creole':1A 'cylinder':10,12 'cylindervery':14 'old':15 'prerock':28 'prince':5B 'princes':7B 'recordings':16,17,18 's':6B 'very':11,13 'wax':9 'wma':21,23,25 'wma32k':27
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  12B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  []
                                        'tag_date'  1902
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561438.790681  (2021-05-09 13:57:18)
                             'size'  2256301