======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '184'
                                          'artist'  'Cal Stewart'
                                     'text_people'  ''
                                         'release'  'Columbia-420 (3737)'
                                           'title'  'Uncle Josh Gets a Letter From Home (1907) '
                                           '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-2', 'q-grit-1', 'q-play-1', "
 "'q-chart-1', 'q-drums-1', 'q-other-1', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['1900s', 'vaudeville', 'all', 'comedy', 'real oldies']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '00'
                                      'tracktotal'  ''
                                            'date'  '1907'
                                        'comments'  ''
                                           'genre'  'prerock-vaudeville'
                                             'bpm'  '104.3'
                                             'key'  '10A'
                                        'acoustid'  ''
rest: ''

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

'COMM:MusicMatch_Preference:\x00\x00\x00'           'Excellent'
'COMM:MusicMatch_Tempo:\x00\x00\x00'                'None'
'TALB' (Album/Movie/Show title)                     'Columbia-420 (3737)'
'TBPM' (BPM (beats per minute))                     '104.3'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vaudeville'
'TDRC' (Recording time)                             '1907'
'TIT2' (Title/songname/content description)         'Uncle Josh Gets a Letter From Home (1907) '
'TKEY' (Initial key)                                '10A'
'TLEN' (Length)                                     '184000'
'TMED' (Media type)                                 'LIN'
'TPE1' (Lead performer(s)/Soloist(s))               'Cal Stewart'
'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', 'vaudeville', 'all', 'comedy', 'real oldies']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'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'                                       '1'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+3.48 dB'
'TXXX:replaygain_track_peak'                        '0.848206'

========================== row from database ==========================
                                              'id'  511039
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1907 - Cal Stewart - Uncle Josh Gets A Letter From Home [spee.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  184
                                           'genre'  prerock-vaudeville
                                        'filesize'  2955687
                                           'mtime'  1620666521
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] A [spee prerock vaudeville
                                      'tag_artist'  Cal Stewart
                                     'tag_release'  Columbia-420 (3737)
                                       'tag_title'  Uncle Josh Gets a Letter From Home (1907) 
                                             'bpm'  104.3
                                    'search_title'  '1907':8,9 'a':4 'from':6 'gets':3 'home':7 'josh':2 'letter':5 'uncle':1
                                   'search_artist'  'cal':1 'stewart':2
                                  'search_release'  '3737':4,5 '420':2 'columbia':1 'columbia420':3
                                     'search_rest'  '1878':11 '1920':12 '32k':14,16,18 'a':20 'cylinder':2,4 'cylindervery':6 'old':7 'prerock':23 'recordings':8,9,10 'spee':21,22 'vaudeville':24 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':27 '1907':8A,9A '1920':28 '32k':30,32,34 '3737':15C,16C '420':13C 'a':4A,36 'cal':10B 'columbia':12C 'columbia420':14C 'cylinder':18,20 'cylindervery':22 'from':6A 'gets':3A 'home':7A 'josh':2A 'letter':5A 'old':23 'prerock':39 'recordings':24,25,26 'spee':37,38 'stewart':11B 'uncle':1A 'vaudeville':40 'very':19,21 'wax':17 'wma':29,31,33 'wma32k':35
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  10A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-1', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['1900s', 'vaudeville', 'all', 'comedy', 'real oldies']
                                        'tag_date'  1907
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620666520.7397707  (2021-05-10 19:08:40)
                             'size'  2955687