======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '160'
                                          'artist'  '[unknown]'
                                     'text_people'  ''
                                         'release'  'Edison recordings'
                                           'title'  'Vincenzo Leotti - Arpeggios'
                                           '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-1', 'q-other-1', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1980'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '144.4'
                                             'key'  '11A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Edison recordings'
'TBPM' (BPM (beats per minute))                     '144.4'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1980'
'TIT2' (Title/songname/content description)         'Vincenzo Leotti - Arpeggios'
'TKEY' (Initial key)                                '11A'
'TPE1' (Lead performer(s)/Soloist(s))               '[unknown]'
'TXXX:Mp3gain_minmax'                               '137,174'
'TXXX:Mp3gain_undo'                                 '+003,+003,N'
'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'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.69 dB'
'TXXX:replaygain_track_peak'                        '0.554513'

========================== row from database ==========================
                                              'id'  511825
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1880 - Edison (V.T. 01-06) - Vincenzo Leotti - Arpeggios.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  160
                                           'genre'  prerock-unsorted
                                        'filesize'  2565452
                                           'mtime'  1621698444
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1880 (V.T. 01 06) prerock unsorted
                                      'tag_artist'  [unknown]
                                     'tag_release'  Edison recordings
                                       'tag_title'  Vincenzo Leotti - Arpeggios
                                             'bpm'  144.4
                                    'search_title'  'arpeggios':3 'leotti':2 'vincenzo':1
                                   'search_artist'  'unknown':1,2
                                  'search_release'  'edison':1 'recordings':2
                                     'search_rest'  '06':24,25 '1878':11 '1880':20 '1920':12 '32k':14,16,18 'cylinder':2,4 'cylindervery':6 'old':7 'prerock':26 'recordings':8,9,10 't':22 'unsorted':27 'v':21 'very':3,5 'vt':23 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '06':31,32 '1878':18 '1880':27 '1920':19 '32k':21,23,25 'arpeggios':3A 'cylinder':9,11 'cylindervery':13 'edison':6C 'leotti':2A 'old':14 'prerock':33 'recordings':7C,15,16,17 't':29 'unknown':4B,5B 'unsorted':34 'v':28 'very':10,12 'vincenzo':1A 'vt':30 'wax':8 'wma':20,22,24 'wma32k':26
                                    '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-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['mysterious', 'unknown', 'all', 'mistagged artist', 'rock']
                                        'tag_date'  1980
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621698444.1702073  (2021-05-22 17:47:24)
                             'size'  2565452