======================== unified (from filesystem) ========================
                                         'bitrate'  '64.0'
                                        'duration'  '93'
                                          'artist'  'Arthur Pryor  - trombone solo'
                                     'text_people'  ''
                                         'release'  'Berliner 3309 - 27 July 1897'
                                           'title'  '"THERE\'LL COME A TIME"'
                                           '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-2', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1900'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '132.3'
                                             'key'  '3A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'PRIV:AverageLevel:p\n\x00\x00'                     PRIV(owner='AverageLevel', data=b'p\n\x00\x00')
'PRIV:PeakValue:Òj\x00\x00'                         PRIV(owner='PeakValue', data=b'\xd2j\x00\x00')
'TALB' (Album/Movie/Show title)                     'Berliner 3309 - 27 July 1897'
'TBPM' (BPM (beats per minute))                     '132.3'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1900'
'TIT2' (Title/songname/content description)         '"THERE\'LL COME A TIME"'
'TKEY' (Initial key)                                '3A'
'TPE1' (Lead performer(s)/Soloist(s))               'Arthur Pryor  - trombone solo'
'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'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '2'
'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'                        '+2.60 dB'
'TXXX:replaygain_track_peak'                        '0.701792'

========================== row from database ==========================
                                              'id'  1496656
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1897 - Arthur Pryor - There_ll Come A Time.mp3
                                         'working'  None
                                         'bitrate'  64
                                    'duration_sec'  93
                                           'genre'  prerock-unsorted
                                        'filesize'  792439
                                           'mtime'  1621698450
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] There_ll Come Time prerock unsorted
                                      'tag_artist'  Arthur Pryor  - trombone solo
                                     'tag_release'  Berliner 3309 - 27 July 1897
                                       'tag_title'  "THERE'LL COME A TIME"
                                             'bpm'  132.3
                                    'search_title'  'a':5 'come':4 'll':2 'there':1 'therell':3 'time':6
                                   'search_artist'  'arthur':1 'pryor':2 'solo':4 'trombone':3
                                  'search_release'  '1897':5 '27':3 '3309':2 'berliner':1 'july':4
                                     'search_rest'  '1878':11 '1920':12 '32k':14,16,18 'come':22 'cylinder':2,4 'cylindervery':6 'll':21 'old':7 'prerock':24 'recordings':8,9,10 'there':20 'time':23 'unsorted':25 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':26 '1897':15C '1920':27 '27':13C '32k':29,31,33 '3309':12C 'a':5A 'arthur':7B 'berliner':11C 'come':4A,37 'cylinder':17,19 'cylindervery':21 'july':14C 'll':2A,36 'old':22 'prerock':39 'pryor':8B 'recordings':23,24,25 'solo':10B 'there':1A,35 'therell':3A 'time':6A,38 'trombone':9B 'unsorted':40 'very':18,20 'wax':16 'wma':28,30,32 'wma32k':34
                                    'tag_tracknum'  None
                                      'num_images'  1
                                             'key'  3A
                                           '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-2', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  []
                                        'tag_date'  1900
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621698449.620873  (2021-05-22 17:47:29)
                             'size'  792439