======================== unified (from filesystem) ========================
                                         'bitrate'  '24.0'
                                        'duration'  '164'
                                          'artist'  'Lady Slavey'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Baby, Baby'
                                           '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-1', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1898'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '89.8'
                                             'key'  '10A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '89.8'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1898'
'TIT2' (Title/songname/content description)         'Baby, Baby'
'TKEY' (Initial key)                                '10A'
'TPE1' (Lead performer(s)/Soloist(s))               'Lady Slavey'
'TXXX:Mp3gain_minmax'                               '080,204'
'TXXX:Mp3gain_undo'                                 '+005,+005,N'
'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: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'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.67 dB'
'TXXX:replaygain_track_peak'                        '0.451238'

========================== row from database ==========================
                                              'id'  511952
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1898 - Baby, Baby, from Lady Slavey (Miss Minnie S. Emmett) c06619~.mp3
                                         'working'  None
                                         'bitrate'  24
                                    'duration_sec'  164
                                           'genre'  prerock-unsorted
                                        'filesize'  495464
                                           'mtime'  1621698450
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1898 from (Miss Minnie S. Emmett) c06619~ prerock unsorted
                                      'tag_artist'  Lady Slavey
                                     'tag_release'  None
                                       'tag_title'  Baby, Baby
                                             'bpm'  89.8
                                    'search_title'  'baby':1,2
                                   'search_artist'  'lady':1 'slavey':2
                                  'search_release'  
                                     'search_rest'  '1878':11 '1898':20 '1920':12 '32k':14,16,18 'c06619':29 'cylinder':2,4 'cylindervery':6 'emmett':27,28 'from':21 'minnie':24 'miss':22,23 'old':7 'prerock':30 'recordings':8,9,10 's':25,26 'unsorted':31 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':15 '1898':24 '1920':16 '32k':18,20,22 'baby':1A,2A 'c06619':33 'cylinder':6,8 'cylindervery':10 'emmett':31,32 'from':25 'lady':3B 'minnie':28 'miss':26,27 'old':11 'prerock':34 'recordings':12,13,14 's':29,30 'slavey':4B 'unsorted':35 'very':7,9 'wax':5 'wma':17,19,21 'wma32k':23
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  10A
                                           '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-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  []
                                        'tag_date'  1898
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621698449.6555421  (2021-05-22 17:47:29)
                             'size'  495464