======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '91'
                                          'artist'  'どくきのこ'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'リズム'
                                           'quals'  ("['Q-UNU-1', 'Q-SYN-3', 'Q-BUSY-2', 'Q-GRIT-2', 'Q-PLAY-2', 'q-bass-3', "
 "'Q-CHART-2', 'Q-JZFKS-1', 'Q-OLDST-3', 'q-drums-4', 'q-other-1', "
 "'q-piano-1', 'q-vocals-1', 'Q-HHRNBTT-1', 'Q-MIXBEAT-3', 'Q-LOCALNESS-1']")
                                      'lastfmtags'  "['house', 'touhou']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'electronic-unsorted'
                                             'bpm'  '127.9'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '127.9'
'TCON' (Content type, a.k.a. Genre)                 'electronic-unsorted'
'TIT2' (Title/songname/content description)         'リズム'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'どくきのこ'
'TXXX:Q-BUSY'                                       '2'
'TXXX:Q-CHART'                                      '2'
'TXXX:Q-GRIT'                                       '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-MIXBEAT'                                    '3'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-PLAY'                                       '2'
'TXXX:Q-SYN'                                        '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['house', 'touhou']
'TXXX:q-bass'                                       '3'
'TXXX:q-drums'                                      '4'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '-2.26 dB'
'TXXX:replaygain_track_peak'                        '0.789202'

========================== row from database ==========================
                                              'id'  1487040
                                            'path'  /data/Music/Bulk/00poprockelectronic/CFM Copyright Free Music Japan/どくきのこ - リズム (Dokukinoko - Rhythm)_350642758 - CFM Copyright Free Music Japan.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  91
                                           'genre'  electronic-unsorted
                                        'filesize'  1473884
                                           'mtime'  1620568224
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic CFM Copyright Free Music Japan (Dokukinoko Rhythm)_350642758 CFM Copyright Free Music Japan electronic unsorted
                                      'tag_artist'  どくきのこ
                                     'tag_release'  None
                                       'tag_title'  リズム
                                             'bpm'  127.9
                                    'search_title'  'risumu':2 'リズム':1
                                   'search_artist'  'tokukinoko':2 'どくきのこ':1
                                  'search_release'  
                                     'search_rest'  '00poprockelectronic':1 '350642758':10,12 'cfm':2 'copyright':3 'dokukinoko':7,8 'electronic':13 'free':4 'japan':6 'music':5 'rhythm':9,11 'unsorted':14
                                    'search_combo'  '00poprockelectronic':5 '350642758':14,16 'cfm':6 'copyright':7 'dokukinoko':11,12 'electronic':17 'free':8 'japan':10 'music':9 'rhythm':13,15 'risumu':2A 'tokukinoko':4B 'unsorted':18 'どくきのこ':3B 'リズム':1A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'Q-MIXBEAT-3', 'Q-OLDST-3', 'Q-GRIT-2', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-CHART-2', 'q-drums-4', 'Q-SYN-3', 'q-other-1', 'Q-BUSY-2', 'Q-PLAY-2', 'q-bass-3']
                                      'lastfmtags'  ['house', 'touhou']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620568224.2643356  (2021-05-09 15:50:24)
                             'size'  1473884