======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '234'
                                          'artist'  'Jones & Spencer'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Race For A Wife (from wax cylinder)'
                                           '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'  '1900'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '101.3'
                                             'key'  '1A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '101.3'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1900'
'TIT2' (Title/songname/content description)         'Race For A Wife (from wax cylinder)'
'TKEY' (Initial key)                                '1A'
'TPE1' (Lead performer(s)/Soloist(s))               'Jones & Spencer'
'TXXX:Mp3gain_minmax'                               '139,190'
'TXXX:Mp3gain_undo'                                 '+001,+001,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'                        '+1.71 dB'
'TXXX:replaygain_track_peak'                        '0.617206'

========================== row from database ==========================
                                              'id'  514546
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/Jones & Spencer - Race For A Wife (from wax cylinder).mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  234
                                           'genre'  prerock-unsorted
                                        'filesize'  3747771
                                           'mtime'  1621698461
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] prerock unsorted
                                      'tag_artist'  Jones & Spencer
                                     'tag_release'  None
                                       'tag_title'  Race For A Wife (from wax cylinder)
                                             'bpm'  101.3
                                    'search_title'  'a':3 'cylinder':8,9 'for':2 'from':5,6 'race':1 'wax':7 'wife':4
                                   'search_artist'  'jones':1 'spencer':2
                                  'search_release'  
                                     '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':22 '1920':23 '32k':25,27,29 'a':3A 'cylinder':8A,9A,13,15 'cylindervery':17 'for':2A 'from':5A,6A 'jones':10B 'old':18 'prerock':31 'race':1A 'recordings':19,20,21 'spencer':11B 'unsorted':32 'very':14,16 'wax':7A,12 'wife':4A 'wma':24,26,28 'wma32k':30
                                    '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-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  []
                                        'tag_date'  1900
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621698460.804796  (2021-05-22 17:47:40)
                             'size'  3747771