======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '175'
                                          'artist'  'Al Jolson'
                                     'text_people'  ''
                                         'release'  'Victor-17081'
                                           'title'  'Ragging The Baby To Sleep 17-4-1912'
                                           '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-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['20s', 'oldies', 'music hall', 'male vocalists', 'jazz', 'vaudeville']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1912'
                                        'comments'  ''
                                           'genre'  'prerock-vocal'
                                             'bpm'  '115.7'
                                             'key'  '5A'
                                        'acoustid'  ''
rest: ''

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

'COMM:MusicMatch_Bio:eng'                           'Sound changed by Breda4@hotmail.com'
'TALB' (Album/Movie/Show title)                     'Victor-17081'
'TBPM' (BPM (beats per minute))                     '115.7'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal'
'TDRC' (Recording time)                             '1912'
'TIT2' (Title/songname/content description)         'Ragging The Baby To Sleep 17-4-1912'
'TKEY' (Initial key)                                '5A'
'TLEN' (Length)                                     '175000'
'TPE1' (Lead performer(s)/Soloist(s))               'Al Jolson'
'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'                                   ['20s', 'oldies', 'music hall', 'male vocalists', 'jazz', 'vaudeville']
'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'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.96 dB'
'TXXX:replaygain_track_peak'                        '0.535655'

========================== row from database ==========================
                                              'id'  512708
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1912 (17-4) - Al Jolson - Ragging The Baby To Sleep.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  175
                                           'genre'  prerock-vocal
                                        'filesize'  3506720
                                           'mtime'  1621853377
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] (17 4) prerock vocal
                                      'tag_artist'  Al Jolson
                                     'tag_release'  Victor-17081
                                       'tag_title'  Ragging The Baby To Sleep 17-4-1912
                                             'bpm'  115.7
                                    'search_title'  '17':6 '1741912':9 '1912':8 '4':7 'baby':3 'ragging':1 'sleep':5 'the':2 'to':4
                                   'search_artist'  'al':1 'jolson':2
                                  'search_release'  '17081':2 'victor':1 'victor17081':3
                                     'search_rest'  '17':20,21 '1878':11 '1920':12 '32k':14,16,18 '4':22,23 'cylinder':2,4 'cylindervery':6 'old':7 'prerock':24 'recordings':8,9,10 'very':3,5 'vocal':25 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '17':6A,34,35 '17081':13C '1741912':9A '1878':25 '1912':8A '1920':26 '32k':28,30,32 '4':7A,36,37 'al':10B 'baby':3A 'cylinder':16,18 'cylindervery':20 'jolson':11B 'old':21 'prerock':38 'ragging':1A 'recordings':22,23,24 'sleep':5A 'the':2A 'to':4A 'very':17,19 'victor':12C 'victor17081':14C 'vocal':39 'wax':15 'wma':27,29,31 'wma32k':33
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  5A
                                           '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-2', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['20s', 'oldies', 'music hall', 'male vocalists', 'jazz', 'vaudeville']
                                        'tag_date'  1912
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621853377.0805993  (2021-05-24 12:49:37)
                             'size'  3506720