======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '122'
                                          'artist'  'Sophie Tucker'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Reuben Rag - Wax Cylinder'
                                           'quals'  ("['Q-HAP-3', 'Q-HHRNBTT-1', 'Q-LOCALNESS-2', 'Q-JZFKS-3', 'Q-UNU-1', "
 "'Q-OLDST-3', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-1', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['20s', '30s', '1920s', 'jazz', 'female vocalists', 'female vocalist']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1910'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-vocal'
                                             'bpm'  '136.1'
                                             'key'  '7B'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '136.1'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-vocal'
'TDRC' (Recording time)                             '1910'
'TIT2' (Title/songname/content description)         'Reuben Rag - Wax Cylinder'
'TKEY' (Initial key)                                '7B'
'TPE1' (Lead performer(s)/Soloist(s))               'Sophie Tucker'
'TXXX:Mp3gain_minmax'                               '123,168'
'TXXX:Mp3gain_undo'                                 '+004,+004,N'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['20s', '30s', '1920s', 'jazz', 'female vocalists', 'female vocalist']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'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'                        '+2.48 dB'
'TXXX:replaygain_track_peak'                        '0.451984'

========================== row from database ==========================
                                              'id'  513901
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1910 - Sophie Tucker - Reuben Rag - Wax Cylinder.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  122
                                           'genre'  prerock-jb-jazz-vocal
                                        'filesize'  1962644
                                           'mtime'  1620539134
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Cylinder／very old recordings： 1878 1920 [wma／32k] 1910 prerock jb jazz vocal
                                      'tag_artist'  Sophie Tucker
                                     'tag_release'  None
                                       'tag_title'  Reuben Rag - Wax Cylinder
                                             'bpm'  136.1
                                    'search_title'  'cylinder':4 'rag':2 'reuben':1 'wax':3
                                   'search_artist'  'sophie':1 'tucker':2
                                  'search_release'  
                                     'search_rest'  '1878':10 '1910':19 '1920':11 '32k':13,15,17 'cylinder':1,3 'cylindervery':5 'jazz':22 'jb':21 'old':6 'prerock':20 'recordings':7,8,9 'very':2,4 'vocal':23 'wma':12,14,16 'wma32k':18
                                    'search_combo'  '1878':16 '1910':25 '1920':17 '32k':19,21,23 'cylinder':4A,7,9 'cylindervery':11 'jazz':28 'jb':27 'old':12 'prerock':26 'rag':2A 'recordings':13,14,15 'reuben':1A 'sophie':5B 'tucker':6B 'very':8,10 'vocal':29 'wax':3A 'wma':18,20,22 'wma32k':24
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  7B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['20s', '30s', '1920s', 'jazz', 'female vocalists', 'female vocalist']
                                        'tag_date'  1910
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620539134.3389306  (2021-05-09 07:45:34)
                             'size'  1962644