======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '182'
                                          'artist'  'George J. Gaskin'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'On The Banks Of The Wabash'
                                           '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-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['grammophon', 'old', 'dead', '1890s', 'under 2000 listeners']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1897'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '90.0'
                                             'key'  '4A'
                                        'acoustid'  ''
rest: ''

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

'COMM::eng'                                         'Debuted 1897 and peaked at #1 on Various Charts. Source: Pop Memories'
'TBPM' (BPM (beats per minute))                     '90.0'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1897'
'TIT2' (Title/songname/content description)         'On The Banks Of The Wabash'
'TKEY' (Initial key)                                '4A'
'TPE1' (Lead performer(s)/Soloist(s))               'George J. Gaskin'
'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'                                   ['grammophon', 'old', 'dead', '1890s', 'under 2000 listeners']
'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'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.60 dB'
'TXXX:replaygain_track_peak'                        '0.423055'

========================== row from database ==========================
                                              'id'  515234
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1897 - 001 - George J. Gaskin - On The Banks Of The Wabash 128 JS (3.02).mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  182
                                           'genre'  prerock-unsorted
                                        'filesize'  2920448
                                           'mtime'  1621698450
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1897 001 128 JS (3.02) prerock unsorted
                                      'tag_artist'  George J. Gaskin
                                     'tag_release'  None
                                       'tag_title'  On The Banks Of The Wabash
                                             'bpm'  90.0
                                    'search_title'  'banks':3 'of':4 'on':1 'the':2 'wabash':5
                                   'search_artist'  'gaskin':4 'george':1 'j':2,3
                                  'search_release'  
                                     'search_rest'  '02':24 '128':21 '1878':11 '1897':20 '1920':12 '3':23 '302':25 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'js':22 'old':7 'prerock':26 'recordings':8,9,10 'unsorted':27 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '02':33 '128':30 '1878':20 '1897':29 '1920':21 '3':32 '302':34 '32k':23,25,27 'banks':3A 'cylinder':11,13 'cylindervery':15 'gaskin':9B 'george':6B 'j':7B,8B 'js':31 'of':4A 'old':16 'on':1A 'prerock':35 'recordings':17,18,19 'the':2A 'unsorted':36 'very':12,14 'wabash':5A 'wax':10 'wma':22,24,26 'wma32k':28
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  4A
                                           '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-2', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['grammophon', 'old', 'dead', '1890s', 'under 2000 listeners']
                                        'tag_date'  1897
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621698449.618243  (2021-05-22 17:47:29)
                             'size'  2920448