======================== unified (from filesystem) ========================
                                         'bitrate'  '80.0'
                                        'duration'  '142'
                                          'artist'  'George Washington Johnson'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'The Laughing Song'
                                           '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'  "['1890']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1891'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '118.2'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'COMM::eng'                                         'Debuted 1891 and peaked at #1 on Various Charts. Source: Pop Memories'
'TBPM' (BPM (beats per minute))                     '118.2'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1891'
'TIT2' (Title/songname/content description)         'The Laughing Song'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'George Washington Johnson'
'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'                                   '1890'
'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'                        '+2.29 dB'
'TXXX:replaygain_track_peak'                        '0.438551'

========================== row from database ==========================
                                              'id'  513500
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1891 - George Washington Johnson [001] - The Laughing Song 80 M (2.22).mp3
                                         'working'  None
                                         'bitrate'  80
                                    'duration_sec'  142
                                           'genre'  prerock-unsorted
                                        'filesize'  1432472
                                           'mtime'  1621698444
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1891 [001] 80 M (2.22) prerock unsorted
                                      'tag_artist'  George Washington Johnson
                                     'tag_release'  None
                                       'tag_title'  The Laughing Song
                                             'bpm'  118.2
                                    'search_title'  'laughing':2 'song':3 'the':1
                                   'search_artist'  'george':1 'johnson':3 'washington':2
                                  'search_release'  
                                     'search_rest'  '001':21,22 '1878':11 '1891':20 '1920':12 '2':25 '22':26 '222':27 '32k':14,16,18 '80':23 'cylinder':2,4 'cylindervery':6 'm':24 'old':7 'prerock':28 'recordings':8,9,10 'unsorted':29 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '001':27,28 '1878':17 '1891':26 '1920':18 '2':31 '22':32 '222':33 '32k':20,22,24 '80':29 'cylinder':8,10 'cylindervery':12 'george':4B 'johnson':6B 'laughing':2A 'm':30 'old':13 'prerock':34 'recordings':14,15,16 'song':3A 'the':1A 'unsorted':35 'very':9,11 'washington':5B 'wax':7 'wma':19,21,23 'wma32k':25
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6A
                                           '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'  ['1890']
                                        'tag_date'  1891
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621698444.232547  (2021-05-22 17:47:24)
                             'size'  1432472