======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '130'
                                          'artist'  'John Yorke AtLee'
                                     'text_people'  ''
                                         'release'  'Columbia-3'
                                           'title'  'The Anvil Chorus (1894) '
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-1', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['1890s', 'old', 'very old', 'acoustic era']"
                                     'discogstags'  "['ragtime', 'jazz']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '00'
                                      'tracktotal'  ''
                                            'date'  '1894'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '127.3'
                                             'key'  '1A'
                                        'acoustid'  ''
rest: ''

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

'COMM:MusicMatch_Preference:\x00\x00\x00'           'Excellent'
'COMM:MusicMatch_Tempo:\x00\x00\x00'                'None'
'TALB' (Album/Movie/Show title)                     'Columbia-3'
'TBPM' (BPM (beats per minute))                     '127.3'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1894'
'TIT2' (Title/songname/content description)         'The Anvil Chorus (1894) '
'TKEY' (Initial key)                                '1A'
'TLEN' (Length)                                     '130000'
'TPE1' (Lead performer(s)/Soloist(s))               'John Yorke AtLee'
'TRCK' (Track number/Position in set)               '00'
'TSSE' (Software/Hardware and settings used for encoding)  'Audiograbber 1.82.00, LAME dll 3.92, 128 Kbit/s, Joint Stereo, Normal quality'
'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:discogstags'                                  ['ragtime', 'jazz']
'TXXX:lastfmtags'                                   ['1890s', 'old', 'very old', 'acoustic era']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'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'                                     '4'
'TXXX:replaygain_track_gain'                        '+4.71 dB'
'TXXX:replaygain_track_peak'                        '0.422226'

========================== row from database ==========================
                                              'id'  513223
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1894 - John Yorke At Lee - The Anvil Chorus - Columbia-3.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  130
                                           'genre'  prerock-unsorted
                                        'filesize'  2096440
                                           'mtime'  1621698450
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] prerock unsorted
                                      'tag_artist'  John Yorke AtLee
                                     'tag_release'  Columbia-3
                                       'tag_title'  The Anvil Chorus (1894) 
                                             'bpm'  127.3
                                    'search_title'  '1894':4,5 'anvil':2 'chorus':3 'the':1
                                   'search_artist'  'at':4 'atlee':3 'john':1 'lee':5 'yorke':2
                                  'search_release'  '3':2 'columbia':1 'columbia3':3
                                     'search_rest'  '1878':11 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'old':7 'prerock':20 'recordings':8,9,10 'unsorted':21 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':24 '1894':4A,5A '1920':25 '3':12C '32k':27,29,31 'anvil':2A 'at':9B 'atlee':8B 'chorus':3A 'columbia':11C 'columbia3':13C 'cylinder':15,17 'cylindervery':19 'john':6B 'lee':10B 'old':20 'prerock':33 'recordings':21,22,23 'the':1A 'unsorted':34 'very':16,18 'wax':14 'wma':26,28,30 'wma32k':32 'yorke':7B
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  1A
                                           '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-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['1890s', 'old', 'very old', 'acoustic era']
                                        'tag_date'  1894
                                     'discogstags'  ['ragtime', 'jazz']

============================== file details ==============================
                                           'mtime'  1621698449.5809896  (2021-05-22 17:47:29)
                             'size'  2096440