======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '130'
                                          'artist'  'Enrico Caruso'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'La Donna E Mobile (rigoletto) 16-3-1908'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-JZFKS-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-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['opera', '10s', 'italian', 'classical', 'tenor']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1908'
                                        'comments'  ''
                                           'genre'  'prerock-vocal-italian'
                                             'bpm'  '144.9'
                                             'key'  '2B'
                                        'acoustid'  ''
rest: ''

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

'COMM:MusicMatch_Bio:eng'                           'Sound changed by Breda4@hotmail.com'
'PRIV:AverageLevel:s\x11\x00\x00'                   PRIV(owner='AverageLevel', data=b's\x11\x00\x00')
'PRIV:PeakValue:}e\x00\x00'                         PRIV(owner='PeakValue', data=b'}e\x00\x00')
'TBPM' (BPM (beats per minute))                     '144.9'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal-italian'
'TDRC' (Recording time)                             '1908'
'TIT2' (Title/songname/content description)         'La Donna E Mobile (rigoletto) 16-3-1908'
'TKEY' (Initial key)                                '2B'
'TLEN' (Length)                                     '130000'
'TPE1' (Lead performer(s)/Soloist(s))               'Enrico Caruso'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['opera', '10s', 'italian', 'classical', 'tenor']
'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'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.46 dB'
'TXXX:replaygain_track_peak'                        '0.471457'

========================== row from database ==========================
                                              'id'  514083
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1908 - Enrico Caruso - La Donna E Mobile (Rigoletto).mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  130
                                           'genre'  prerock-vocal-italian
                                        'filesize'  2609068
                                           'mtime'  1621509256
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] (Rigoletto) prerock vocal italian
                                      'tag_artist'  Enrico Caruso
                                     'tag_release'  None
                                       'tag_title'  La Donna E Mobile (rigoletto) 16-3-1908
                                             'bpm'  144.9
                                    'search_title'  '16':7 '1631908':10 '1908':9 '3':8 'donna':2 'e':3 'la':1 'mobile':4 'rigoletto':5,6
                                   'search_artist'  'caruso':2 'enrico':1
                                  'search_release'  
                                     'search_rest'  '1878':11 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'italian':24 'old':7 'prerock':22 'recordings':8,9,10 'rigoletto':20,21 'very':3,5 'vocal':23 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '16':7A '1631908':10A '1878':23 '1908':9A '1920':24 '3':8A '32k':26,28,30 'caruso':12B 'cylinder':14,16 'cylindervery':18 'donna':2A 'e':3A 'enrico':11B 'italian':36 'la':1A 'mobile':4A 'old':19 'prerock':34 'recordings':20,21,22 'rigoletto':5A,6A,32,33 'very':15,17 'vocal':35 'wax':13 'wma':25,27,29 'wma32k':31
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  2B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['opera', '10s', 'italian', 'classical', 'tenor']
                                        'tag_date'  1908
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621509255.654508  (2021-05-20 13:14:15)
                             'size'  2609068