======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '156'
                                          'artist'  'Walter van Brunt'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'That Railroad Rag 1911'
                                           '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-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['1900s', 'age of steam', 'the vitamin b12', 'steam', '1910s']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '00'
                                      'tracktotal'  ''
                                            'date'  '1911'
                                        'comments'  ''
                                           'genre'  'prerock-vocal'
                                             'bpm'  '142.7'
                                             'key'  '7B'
                                        'acoustid'  ''
rest: ''

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

'COMM:MusicMatch_Tempo:\x00\x00\x00'                'None'
'TBPM' (BPM (beats per minute))                     '142.7'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal'
'TDRC' (Recording time)                             '1911'
'TIT2' (Title/songname/content description)         'That Railroad Rag 1911'
'TKEY' (Initial key)                                '7B'
'TLEN' (Length)                                     '156000'
'TPE1' (Lead performer(s)/Soloist(s))               'Walter van Brunt'
'TRCK' (Track number/Position in set)               '00'
'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'                                   ['1900s', 'age of steam', 'the vitamin b12', 'steam', '1910s']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'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'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.02 dB'
'TXXX:replaygain_track_peak'                        '0.420217'

========================== row from database ==========================
                                              'id'  510955
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1911 - Walter Van Brunt - That Railroad Rag.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  156
                                           'genre'  prerock-vocal
                                        'filesize'  3134652
                                           'mtime'  1621853377
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] Van prerock vocal
                                      'tag_artist'  Walter van Brunt
                                     'tag_release'  None
                                       'tag_title'  That Railroad Rag 1911
                                             'bpm'  142.7
                                    'search_title'  '1911':4 'rag':3 'railroad':2 'that':1
                                   'search_artist'  'brunt':3 'van':2 'walter':1
                                  'search_release'  
                                     'search_rest'  '1878':11 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'old':7 'prerock':21 'recordings':8,9,10 'van':20 'very':3,5 'vocal':22 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':18 '1911':4A '1920':19 '32k':21,23,25 'brunt':7B 'cylinder':9,11 'cylindervery':13 'old':14 'prerock':28 'rag':3A 'railroad':2A 'recordings':15,16,17 'that':1A 'van':6B,27 'very':10,12 'vocal':29 'walter':5B 'wax':8 'wma':20,22,24 'wma32k':26
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  7B
                                           '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-2', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['1900s', 'age of steam', 'the vitamin b12', 'steam', '1910s']
                                        'tag_date'  1911
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621853377.0122902  (2021-05-24 12:49:37)
                             'size'  3134652