======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '161'
                                          'artist'  'Fred Van Eps'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Ragging The Scale 1-6-1916'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-JZFKS-2', '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-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['instrumental', 'everything', 'all', 'banjo', 'ragtime']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1916'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '95.7'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'COMM:MusicMatch_Bio:eng'                           'Sound changed by Breda4@hotmail.com'
'COMM:icMatch_Tempo:Mus'                            'None'
'TBPM' (BPM (beats per minute))                     '95.7'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1916'
'TIT2' (Title/songname/content description)         'Ragging The Scale 1-6-1916'
'TKEY' (Initial key)                                '9A'
'TLEN' (Length)                                     '161856'
'TPE1' (Lead performer(s)/Soloist(s))               'Fred Van Eps'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['instrumental', 'everything', 'all', 'banjo', 'ragtime']
'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'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+2.27 dB'
'TXXX:replaygain_track_peak'                        '0.418023'

========================== row from database ==========================
                                              'id'  513836
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1916 - Fred Van Eps - Ragging The Scale.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  161
                                           'genre'  prerock-unsorted
                                        'filesize'  3232872
                                           'mtime'  1678927396
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] prerock unsorted
                                      'tag_artist'  Fred Van Eps
                                     'tag_release'  None
                                       'tag_title'  Ragging The Scale 1-6-1916
                                             'bpm'  95.7
                                    'search_title'  '1':4 '161916':7 '1916':6 '6':5 'ragging':1 'scale':3 'the':2
                                   'search_artist'  'eps':3 'fred':1 'van':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'  '1':4A '161916':7A '1878':21 '1916':6A '1920':22 '32k':24,26,28 '6':5A 'cylinder':12,14 'cylindervery':16 'eps':10B 'fred':8B 'old':17 'prerock':30 'ragging':1A 'recordings':18,19,20 'scale':3A 'the':2A 'unsorted':31 'van':9B 'very':13,15 'wax':11 'wma':23,25,27 'wma32k':29
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-JZFKS-2', '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-4', 'q-piano-1', 'q-vocals-1', 'q-mixbeat-1']
                                      'lastfmtags'  ['instrumental', 'everything', 'all', 'banjo', 'ragtime']
                                        'tag_date'  1916
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1678927396.3440099  (2023-03-16 01:43:16)
                             'size'  3232872