======================== unified (from filesystem) ========================
                                         'bitrate'  '214.869'
                                        'duration'  '34'
                                          'artist'  '[unknown]'
                                     'text_people'  ''
                                         'release'  'african musical instruments'
                                           'title'  'tambourine dance'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-OLDST-1', 'Q-HHRNBTT-1', 'Q-UNU-3', "
 "'Q-LOCALNESS-4', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-1', 'q-drums-4', 'q-other-1', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '03'
                                      'tracktotal'  ''
                                            'date'  '1970'
                                        'comments'  ''
                                           'genre'  'loc-africa'
                                             'bpm'  '135.365'
                                             'key'  '1A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'TALB' (Album/Movie/Show title)                     'african musical instruments'
'TBPM' (BPM (beats per minute))                     '135.365'
'TCON' (Content type, a.k.a. Genre)                 'loc-africa'
'TDRC' (Recording time)                             '1970'
'TIT2' (Title/songname/content description)         'tambourine dance'
'TKEY' (Initial key)                                '1A'
'TPE1' (Lead performer(s)/Soloist(s))               '[unknown]'
'TPUB' (Publisher)                                  'smithsonian folkways'
'TRCK' (Track number/Position in set)               '03'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '4'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '3'
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+3.07 dB'
'TXXX:replaygain_track_peak'                        '0.994641'

========================== row from database ==========================
                                              'id'  474959
                                            'path'  /data/Music/Bulk/00localcharacter/VA. World 1： Trad/African Musical Instruments (Smithsonian Folkways Records, 1970) [224-320kvbr]/va - 03 - tambourine dance.mp3
                                         'working'  None
                                         'bitrate'  215
                                    'duration_sec'  34
                                           'genre'  loc-africa
                                        'filesize'  955517
                                           'mtime'  1620586265
                                   'redo_metaread'  0
                                        'rest_str'   00localcharacter VA. World 1： Trad African Musical Instruments (Smithsonian Folkways Records, 1970) [224 320kvbr] va 03 loc
                                      'tag_artist'  [unknown]
                                     'tag_release'  african musical instruments
                                       'tag_title'  tambourine dance
                                             'bpm'  135.365
                                    'search_title'  'dance':2 'tambourine':1
                                   'search_artist'  'unknown':1,2
                                  'search_release'  'african':1 'instruments':3 'musical':2
                                     'search_rest'  '1':4,5,6 '1970':16,17 '224':18,19 '320kvbr':20,21 'african':8 'folkways':13 'instruments':10 'loc':22 'musical':9 'records':14,15 'smithsonian':11,12 'trad':7 'va':1,2 'world':3
                                    'search_combo'  '1':11,12,13 '1970':23,24 '224':25,26 '320kvbr':27,28 'african':5C,15 'dance':2A 'folkways':20 'instruments':7C,17 'loc':29 'musical':6C,16 'records':21,22 'smithsonian':18,19 'tambourine':1A 'trad':14 'unknown':3B,4B 'va':8,9 'world':10
                                    'tag_tracknum'  3
                                      'num_images'  1
                                             'key'  1A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-4', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-3', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-4', 'q-syn-1', 'q-chart-1', 'q-other-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['mysterious', 'unknown', 'all', 'mistagged artist', 'rock']
                                        'tag_date'  1970
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620586265.365023  (2021-05-09 20:51:05)
                             'size'  955517