======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '23'
                                          'artist'  'Emile Berliner'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Twinkle, Twinkle Little Star (1st gramophone record)'
                                           '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-1', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['gramophone', '1890s', 'vocal']"
                                     'discogstags'  "['non-music', 'speech']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1987'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '117.9'
                                             'key'  '6B'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '117.9'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1987'
'TIT2' (Title/songname/content description)         'Twinkle, Twinkle Little Star (1st gramophone record)'
'TKEY' (Initial key)                                '6B'
'TPE1' (Lead performer(s)/Soloist(s))               'Emile Berliner'
'TXXX:Mp3gain_minmax'                               '115,176'
'TXXX:Mp3gain_undo'                                 '+002,+002,N'
'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:discogstags'                                  ['non-music', 'speech']
'TXXX:lastfmtags'                                   ['gramophone', '1890s', 'vocal']
'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'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.09 dB'
'TXXX:replaygain_track_peak'                        '0.315613'

========================== row from database ==========================
                                              'id'  513370
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1887 - Emile Berliner - Twinkle, Twinkle Little Star (1st gramophone record).mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  23
                                           'genre'  prerock-unsorted
                                        'filesize'  377798
                                           'mtime'  1621698444
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1887 prerock unsorted
                                      'tag_artist'  Emile Berliner
                                     'tag_release'  None
                                       'tag_title'  Twinkle, Twinkle Little Star (1st gramophone record)
                                             'bpm'  117.9
                                    'search_title'  '1st':5,6 'gramophone':7 'little':3 'record':8,9 'star':4 'twinkle':1,2
                                   'search_artist'  'berliner':2 'emile':1
                                  'search_release'  
                                     'search_rest'  '1878':11 '1887':20 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'old':7 'prerock':21 'recordings':8,9,10 'unsorted':22 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':22 '1887':31 '1920':23 '1st':5A,6A '32k':25,27,29 'berliner':11B 'cylinder':13,15 'cylindervery':17 'emile':10B 'gramophone':7A 'little':3A 'old':18 'prerock':32 'record':8A,9A 'recordings':19,20,21 'star':4A 'twinkle':1A,2A 'unsorted':33 'very':14,16 'wax':12 'wma':24,26,28 'wma32k':30
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6B
                                           '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-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['gramophone', '1890s', 'vocal']
                                        'tag_date'  1987
                                     'discogstags'  ['non-music', 'speech']

============================== file details ==============================
                                           'mtime'  1621698444.1739569  (2021-05-22 17:47:24)
                             'size'  377798