======================== unified (from filesystem) ========================
                                         'bitrate'  '48.0'
                                        'duration'  '126'
                                          'artist'  '[unknown]'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'The Lost Chord - (Cornet and Piano)'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-1', 'q-play-3', "
 "'q-chart-2', 'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1988'
                                        'comments'  ''
                                           'genre'  'prerock-instrumental'
                                             'bpm'  '144.3'
                                             'key'  '1A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '144.3'
'TCON' (Content type, a.k.a. Genre)                 'prerock-instrumental'
'TDRC' (Recording time)                             '1988'
'TIT2' (Title/songname/content description)         'The Lost Chord - (Cornet and Piano)'
'TKEY' (Initial key)                                '1A'
'TPE1' (Lead performer(s)/Soloist(s))               '[unknown]'
'TXXX:Mp3gain_minmax'                               '150,194'
'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: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'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+4.08 dB'
'TXXX:replaygain_track_peak'                        '0.997326'

========================== row from database ==========================
                                              'id'  511606
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1888 - Edison (1st music on gramophone) Arthur Sullivan - The Lost Chord - (Cornet and Piano).mp3
                                         'working'  None
                                         'bitrate'  48
                                    'duration_sec'  126
                                           'genre'  prerock-instrumental
                                        'filesize'  761561
                                           'mtime'  1621705418
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1888 Edison (1st music on gramophone) Arthur Sullivan prerock instrumental
                                      'tag_artist'  [unknown]
                                     'tag_release'  None
                                       'tag_title'  The Lost Chord - (Cornet and Piano)
                                             'bpm'  144.3
                                    'search_title'  'and':6 'chord':3 'cornet':4,5 'lost':2 'piano':7,8 'the':1
                                   'search_artist'  'unknown':1,2
                                  'search_release'  
                                     'search_rest'  '1878':11 '1888':20 '1920':12 '1st':22,23 '32k':14,16,18 'arthur':28 'cylinder':2,4 'cylindervery':6 'edison':21 'gramophone':26,27 'instrumental':31 'music':24 'old':7 'on':25 'prerock':30 'recordings':8,9,10 'sullivan':29 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':21 '1888':30 '1920':22 '1st':32,33 '32k':24,26,28 'and':6A 'arthur':38 'chord':3A 'cornet':4A,5A 'cylinder':12,14 'cylindervery':16 'edison':31 'gramophone':36,37 'instrumental':41 'lost':2A 'music':34 'old':17 'on':35 'piano':7A,8A 'prerock':40 'recordings':18,19,20 'sullivan':39 'the':1A 'unknown':9B,10B 'very':13,15 'wax':11 'wma':23,25,27 'wma32k':29
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  1A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', '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'  ['mysterious', 'unknown', 'all', 'mistagged artist', 'rock']
                                        'tag_date'  1988
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621705418.0702102  (2021-05-22 19:43:38)
                             'size'  761561