======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '136'
                                          'artist'  'James Scott Skinner'
                                     'text_people'  ''
                                         'release'  'Edison Standard Record: 10402'
                                           'title'  "The birlin' reels"
                                           '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-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['scotland', 'folk', 'composer', 'all', 'britain']"
                                     'discogstags'  "['folk, world, & country']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1910'
                                        'comments'  ''
                                           'genre'  'prerock-instrumental'
                                             'bpm'  '110.8'
                                             'key'  '6B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Edison Standard Record: 10402'
'TBPM' (BPM (beats per minute))                     '110.8'
'TCON' (Content type, a.k.a. Genre)                 'prerock-instrumental'
'TCOP' (Copyright message)                          '© 2004 Regents of the University of California'
'TDRC' (Recording time)                             '1910'
'TIT2' (Title/songname/content description)         "The birlin' reels"
'TKEY' (Initial key)                                '6B'
'TPE1' (Lead performer(s)/Soloist(s))               'James Scott Skinner'
'TXXX:Engineer'                                     'Noah Pollaczek'
'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:discogstags'                                  'folk, world, & country'
'TXXX:lastfmtags'                                   ['scotland', 'folk', 'composer', 'all', 'britain']
'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'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.61 dB'
'TXXX:replaygain_track_peak'                        '0.714468'

========================== row from database ==========================
                                              'id'  1513821
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1910 - J. Scott Skinner - The birlin_ reels.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  136
                                           'genre'  prerock-instrumental
                                        'filesize'  2183040
                                           'mtime'  1621705418
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1910 J. birlin_ prerock instrumental
                                      'tag_artist'  James Scott Skinner
                                     'tag_release'  Edison Standard Record: 10402
                                       'tag_title'  The birlin' reels
                                             'bpm'  110.8
                                    'search_title'  'birlin':2,3 'reels':4 'the':1
                                   'search_artist'  'james':1 'scott':2 'skinner':3
                                  'search_release'  '10402':5 'edison':1 'record':3,4 'standard':2
                                     'search_rest'  '1878':11 '1910':20 '1920':12 '32k':14,16,18 'birlin':23 'cylinder':2,4 'cylindervery':6 'instrumental':25 'j':21,22 'old':7 'prerock':24 'recordings':8,9,10 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '10402':12C '1878':23 '1910':32 '1920':24 '32k':26,28,30 'birlin':2A,3A,35 'cylinder':14,16 'cylindervery':18 'edison':8C 'instrumental':37 'j':33,34 'james':5B 'old':19 'prerock':36 'record':10C,11C 'recordings':20,21,22 'reels':4A 'scott':6B 'skinner':7B 'standard':9C 'the':1A 'very':15,17 'wax':13 'wma':25,27,29 'wma32k':31
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', '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-1', 'q-syn-1', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['scotland', 'folk', 'composer', 'all', 'britain']
                                        'tag_date'  1910
                                     'discogstags'  ['folk, world, & country']

============================== file details ==============================
                                           'mtime'  1621705418.0713832  (2021-05-22 19:43:38)
                             'size'  2183040