======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '129'
                                          'artist'  'Len Spencer & Vess Ossman'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'A Hot Time on The Levee'
                                           'quals'  ("['Q-HAP-2', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-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'  "['1890s', 'acoustic era']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1896'
                                        'comments'  ''
                                           'genre'  'prerock-nonmusic'
                                             'bpm'  '132.5'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

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

'COMM::eng'                                         ('Debuted 1896 and peaked at #1 on Various Charts. Source: Pop Memories\r\n'
 'Columbia 7200')
'TBPM' (BPM (beats per minute))                     '132.5'
'TCON' (Content type, a.k.a. Genre)                 'prerock-nonmusic'
'TDRC' (Recording time)                             '1896'
'TIT2' (Title/songname/content description)         'A Hot Time on The Levee'
'TKEY' (Initial key)                                '9B'
'TPE1' (Lead performer(s)/Soloist(s))               'Len Spencer & Vess Ossman'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['1890s', 'acoustic era']
'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'                        '+3.54 dB'
'TXXX:replaygain_track_peak'                        '0.534990'

========================== row from database ==========================
                                              'id'  512939
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1896 - Len Spencer & Vess Ossman - A Hot Time on The Levee.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  129
                                           'genre'  prerock-nonmusic
                                        'filesize'  2070400
                                           'mtime'  1674646639
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1896 prerock nonmusic
                                      'tag_artist'  Len Spencer & Vess Ossman
                                     'tag_release'  None
                                       'tag_title'  A Hot Time on The Levee
                                             'bpm'  132.5
                                    'search_title'  'a':1 'hot':2 'levee':6 'on':4 'the':5 'time':3
                                   'search_artist'  'len':1 'ossman':4 'spencer':2 'vess':3
                                  'search_release'  
                                     'search_rest'  '1878':11 '1896':20 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'nonmusic':22 'old':7 'prerock':21 'recordings':8,9,10 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':21 '1896':30 '1920':22 '32k':24,26,28 'a':1A 'cylinder':12,14 'cylindervery':16 'hot':2A 'len':7B 'levee':6A 'nonmusic':32 'old':17 'on':4A 'ossman':10B 'prerock':31 'recordings':18,19,20 'spencer':8B 'the':5A 'time':3A 'very':13,15 'vess':9B 'wax':11 'wma':23,25,27 'wma32k':29
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9B
                                           'quals'  ['Q-HAP-2', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-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'  ['1890s', 'acoustic era']
                                        'tag_date'  1896
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1674646639.2675855  (2023-01-25 12:37:19)
                             'size'  2070400