======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '176'
                                          'artist'  'Zhou Xuan'
                                     'text_people'  ''
                                         'release'  'The Legendary Chinese Hits Vol. 4'
                                           'title'  'The Girl of Xizi (Part 2)'
                                           'quals'  ("['Q-HAP-3', 'Q-OLDST-2', 'Q-JZFKS-1', 'Q-UNU-2', 'Q-HHRNBTT-1', "
 "'Q-LOCALNESS-3', 'q-syn-1', 'q-bass-4', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['shidaiqu', 'chinese', 'chinese oldies', 'female vocalists', 'vocal']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '11'
                                      'tracktotal'  ''
                                            'date'  '1992'
                                        'comments'  ''
                                           'genre'  'loc-asia-china'
                                             'bpm'  '99.763'
                                             'key'  '10A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'COMM:ID3v1 Comment:XXX'                            ' 00000516 0000056D 00003FE2'
'COMM:iTunNORM:eng'                                 (' 00000516 0000056D 00003FE2 00004467 0001E6BC 0001E6BC 00007B56 00007BA3 '
 '0000B397 0000B397')
'COMM:iTunPGAP:eng'                                 '1'
'COMM:iTunes_CDDB_IDs:eng'                          '15+D84304CA57131F7D016FA2E7E682EC25+2941359'
'TALB' (Album/Movie/Show title)                     'The Legendary Chinese Hits Vol. 4'
'TBPM' (BPM (beats per minute))                     '99.763'
'TCON' (Content type, a.k.a. Genre)                 'loc-asia-china'
'TDRC' (Recording time)                             '1992'
'TENC' (Encoded by)                                 'iTunes v4.6'
'TIT2' (Title/songname/content description)         'The Girl of Xizi (Part 2)'
'TKEY' (Initial key)                                '10A'
'TPE1' (Lead performer(s)/Soloist(s))               'Zhou Xuan'
'TPOS' (Part of a set)                              '4/5'
'TRCK' (Track number/Position in set)               '11'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '2'
'TXXX:lastfmtags'                                   ['shidaiqu', 'chinese', 'chinese oldies', 'female vocalists', 'vocal']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '-0.50 dB'
'TXXX:replaygain_track_peak'                        '0.576246'

========================== row from database ==========================
                                              'id'  930289
                                            'path'  /data/Music/Bulk/00localcharacter/00asia/The Legendary Chinese Hits/4-11 The Girl of Xizi (Part 2).mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  176
                                           'genre'  loc-asia-china
                                        'filesize'  4847600
                                           'mtime'  1621629176
                                   'redo_metaread'  0
                                        'rest_str'   00localcharacter 00asia 11 loc asia china
                                      'tag_artist'  Zhou Xuan
                                     'tag_release'  The Legendary Chinese Hits Vol. 4
                                       'tag_title'  The Girl of Xizi (Part 2)
                                             'bpm'  99.763
                                    'search_title'  '2':7,8 'girl':2 'of':3 'part':5,6 'the':1 'xizi':4
                                   'search_artist'  'xuan':2 'zhou':1
                                  'search_release'  '4':7 'chinese':3 'hits':4 'legendary':2 'the':1 'vol':5,6
                                     'search_rest'  '00asia':1 'asia':3 'china':4 'loc':2
                                    'search_combo'  '00asia':18 '2':7A,8A '4':17C 'asia':20 'china':21 'chinese':13C 'girl':2A 'hits':14C 'legendary':12C 'loc':19 'of':3A 'part':5A,6A 'the':1A,11C 'vol':15C,16C 'xizi':4A 'xuan':10B 'zhou':9B
                                    'tag_tracknum'  11
                                      'num_images'  1
                                             'key'  10A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-2', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['shidaiqu', 'chinese', 'chinese oldies', 'female vocalists', 'vocal']
                                        'tag_date'  1992
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621629175.615953  (2021-05-21 22:32:55)
                             'size'  4847600