======================== unified (from filesystem) ========================
                                         'bitrate'  '32.0'
                                        'duration'  '200'
                                          'artist'  'Billy Murray'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  "He'd Have to Get Under (US)"
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-1', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  ("['all', 'really really oldies', 'music hall', 'vaudeville', 'real oldies', "
 "'gramophone']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1913'
                                        'comments'  ''
                                           'genre'  'prerock-vocal'
                                             'bpm'  '86.0'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '86.0'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal'
'TDRC' (Recording time)                             '1913'
'TIT2' (Title/songname/content description)         "He'd Have to Get Under (US)"
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Billy Murray'
'TXXX:Mp3gain_minmax'                               '098,183'
'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:lastfmtags'                                   ['all',
 'really really oldies',
 'music hall',
 'vaudeville',
 'real oldies',
 'gramophone']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'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'                        '+1.53 dB'
'TXXX:replaygain_track_peak'                        '0.658594'

========================== row from database ==========================
                                              'id'  1513105
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1913 - Billy Murray - He_d Have to Get Under (US).mp3
                                         'working'  None
                                         'bitrate'  32
                                    'duration_sec'  200
                                           'genre'  prerock-vocal
                                        'filesize'  803229
                                           'mtime'  1621853377
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1913 He_d prerock vocal
                                      'tag_artist'  Billy Murray
                                     'tag_release'  None
                                       'tag_title'  He'd Have to Get Under (US)
                                             'bpm'  86.0
                                    'search_title'  'd':2 'get':6 'have':4 'he':1 'hed':3 'to':5 'under':7 'us':8,9
                                   'search_artist'  'billy':1 'murray':2
                                  'search_release'  
                                     'search_rest'  '1878':11 '1913':20 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'd':22 'he':21 'old':7 'prerock':23 'recordings':8,9,10 'very':3,5 'vocal':24 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':22 '1913':31 '1920':23 '32k':25,27,29 'billy':10B 'cylinder':13,15 'cylindervery':17 'd':2A,33 'get':6A 'have':4A 'he':1A,32 'hed':3A 'murray':11B 'old':18 'prerock':34 'recordings':19,20,21 'to':5A 'under':7A 'us':8A,9A 'very':14,16 'vocal':35 'wax':12 'wma':24,26,28 'wma32k':30
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9A
                                           '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-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['all', 'really really oldies', 'music hall', 'vaudeville', 'real oldies', 'gramophone']
                                        'tag_date'  1913
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621853377.1839368  (2021-05-24 12:49:37)
                             'size'  803229