======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '29'
                                          'artist'  'United States Marine Band'
                                     'text_people'  ''
                                         'release'  'Sousa II'
                                           'title'  'The Thunderer March (Historic 1896 recording) (Demo)'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-2', 'Q-LOCALNESS-1', 'Q-UNU-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-3', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['marschmusik', 'military', 'american', 'military band', 'classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '11'
                                      'tracktotal'  ''
                                            'date'  '1900'
                                        'comments'  ''
                                           'genre'  'prerock-band'
                                             'bpm'  '123.5'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'LINK:WCOh:ttp://www.emusic.com/albums/26627/:LINK'  LINK(frameid='WCOh', url='ttp://www.emusic.com/albums/26627/', data=b'LINK')
'TALB' (Album/Movie/Show title)                     'Sousa II'
'TBPM' (BPM (beats per minute))                     '123.5'
'TCON' (Content type, a.k.a. Genre)                 'prerock-band'
'TDRC' (Recording time)                             '1900'
'TIT2' (Title/songname/content description)         'The Thunderer March (Historic 1896 recording) (Demo)'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'United States Marine Band'
'TRCK' (Track number/Position in set)               '11'
'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'                                   ['marschmusik', 'military', 'american', 'military band', 'classical']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '-0.98 dB'
'TXXX:replaygain_track_peak'                        '0.334169'

========================== row from database ==========================
                                              'id'  514788
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1896 - USMC Band - Thunderer March.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  29
                                           'genre'  prerock-band
                                        'filesize'  481337
                                           'mtime'  1620561433
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] USMC prerock band
                                      'tag_artist'  United States Marine Band
                                     'tag_release'  Sousa II
                                       'tag_title'  The Thunderer March (Historic 1896 recording) (Demo)
                                             'bpm'  123.5
                                    'search_title'  '1896':6 'demo':9,10 'historic':4,5 'march':3 'recording':7,8 'the':1 'thunderer':2
                                   'search_artist'  'band':4 'marine':3 'states':2 'united':1
                                  'search_release'  'ii':2 'sousa':1
                                     'search_rest'  '1878':11 '1920':12 '32k':14,16,18 'band':22 'cylinder':2,4 'cylindervery':6 'old':7 'prerock':21 'recordings':8,9,10 'usmc':20 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':27 '1896':6A '1920':28 '32k':30,32,34 'band':14B,38 'cylinder':18,20 'cylindervery':22 'demo':9A,10A 'historic':4A,5A 'ii':16C 'march':3A 'marine':13B 'old':23 'prerock':37 'recording':7A,8A 'recordings':24,25,26 'sousa':15C 'states':12B 'the':1A 'thunderer':2A 'united':11B 'usmc':36 'very':19,21 'wax':17 'wma':29,31,33 'wma32k':35
                                    'tag_tracknum'  11
                                      'num_images'  0
                                             'key'  8A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-3', 'q-drums-3', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['marschmusik', 'military', 'american', 'military band', 'classical']
                                        'tag_date'  1900
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561432.8120186  (2021-05-09 13:57:12)
                             'size'  481337