======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '200'
                                          'artist'  'Edward Meeker'
                                     'text_people'  ''
                                         'release'  'Edison 2230'
                                           'title'  "I'm Crazy 'Bout a Ragtime Band 1914"
                                           '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-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  ("['1900s', 'gramophone', 'lesser known yet streamable artists', 'cylinder', "
 "'all']")
                                     'discogstags'  "['pop', 'vocal']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1914'
                                        'comments'  ''
                                           'genre'  'prerock-vocal'
                                             'bpm'  '145.7'
                                             'key'  '11A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Edison 2230'
'TBPM' (BPM (beats per minute))                     '145.7'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal'
'TDRC' (Recording time)                             '1914'
'TIT2' (Title/songname/content description)         "I'm Crazy 'Bout a Ragtime Band 1914"
'TKEY' (Initial key)                                '11A'
'TPE1' (Lead performer(s)/Soloist(s))               'Edward Meeker'
'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'                                  ['pop', 'vocal']
'TXXX:lastfmtags'                                   ['1900s',
 'gramophone',
 'lesser known yet streamable artists',
 'cylinder',
 'all']
'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'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.64 dB'
'TXXX:replaygain_track_peak'                        '0.330082'

========================== row from database ==========================
                                              'id'  1500099
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1914 - Edward Meeker - I_m Crazy _Bout A Ragtime Band.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  200
                                           'genre'  prerock-vocal
                                        'filesize'  3213184
                                           'mtime'  1621853377
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] I_m _Bout A prerock vocal
                                      'tag_artist'  Edward Meeker
                                     'tag_release'  Edison 2230
                                       'tag_title'  I'm Crazy 'Bout a Ragtime Band 1914
                                             'bpm'  145.7
                                    'search_title'  '1914':10 'a':7 'band':9 'bout':5,6 'crazy':4 'i':1 'im':3 'm':2 'ragtime':8
                                   'search_artist'  'edward':1 'meeker':2
                                  'search_release'  '2230':2 'edison':1
                                     'search_rest'  '1878':11 '1920':12 '32k':14,16,18 'a':23 'bout':22 'cylinder':2,4 'cylindervery':6 'i':20 'm':21 'old':7 'prerock':24 'recordings':8,9,10 'very':3,5 'vocal':25 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':25 '1914':10A '1920':26 '2230':14C '32k':28,30,32 'a':7A,37 'band':9A 'bout':5A,6A,36 'crazy':4A 'cylinder':16,18 'cylindervery':20 'edison':13C 'edward':11B 'i':1A,34 'im':3A 'm':2A,35 'meeker':12B 'old':21 'prerock':38 'ragtime':8A 'recordings':22,23,24 'very':17,19 'vocal':39 'wax':15 'wma':27,29,31 'wma32k':33
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  11A
                                           '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-2', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['1900s', 'gramophone', 'lesser known yet streamable artists', 'cylinder', 'all']
                                        'tag_date'  1914
                                     'discogstags'  ['pop', 'vocal']

============================== file details ==============================
                                           'mtime'  1621853377.3235075  (2021-05-24 12:49:37)
                             'size'  3213184