======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '123'
                                          'artist'  'Edward Meeker'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Take Me Out to the Ball Game  '
                                           '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'  '1908'
                                        'comments'  ''
                                           'genre'  'prerock-vocal'
                                             'bpm'  '85.0'
                                             'key'  '5A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '85.0'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal'
'TDRC' (Recording time)                             '1908'
'TIT2' (Title/songname/content description)         'Take Me Out to the Ball Game  '
'TKEY' (Initial key)                                '5A'
'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'                        '+2.81 dB'
'TXXX:replaygain_track_peak'                        '0.498505'

========================== row from database ==========================
                                              'id'  512532
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1908 - Edward Meeker - Take Me Out to the Ball Game.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  123
                                           'genre'  prerock-vocal
                                        'filesize'  1974397
                                           'mtime'  1621853376
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1908 prerock vocal
                                      'tag_artist'  Edward Meeker
                                     'tag_release'  None
                                       'tag_title'  Take Me Out to the Ball Game  
                                             'bpm'  85.0
                                    'search_title'  'ball':6 'game':7 'me':2 'out':3 'take':1 'the':5 'to':4
                                   'search_artist'  'edward':1 'meeker':2
                                  'search_release'  
                                     'search_rest'  '1878':11 '1908':20 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'old':7 'prerock':21 'recordings':8,9,10 'very':3,5 'vocal':22 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':20 '1908':29 '1920':21 '32k':23,25,27 'ball':6A 'cylinder':11,13 'cylindervery':15 'edward':8B 'game':7A 'me':2A 'meeker':9B 'old':16 'out':3A 'prerock':30 'recordings':17,18,19 'take':1A 'the':5A 'to':4A 'very':12,14 'vocal':31 'wax':10 'wma':22,24,26 'wma32k':28
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  5A
                                           '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'  1908
                                     'discogstags'  ['pop', 'vocal']

============================== file details ==============================
                                           'mtime'  1621853375.9062116  (2021-05-24 12:49:35)
                             'size'  1974397