======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '979'
                                          'artist'  'John Balaban'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Commentary on Ca Dao Collection'
                                           'quals'  ("['Q-OLDST-2', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-2', 'Q-HHRNBTT-1', "
 "'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', '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'  '1'
                                      'tracktotal'  '1'
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'loc-unsorted'
                                             'bpm'  '128.170'
                                             'key'  '1A'
                                        'acoustid'  ''
rest: ''

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

'COMM:ID3v1 Comment:XXX'                            ' 0000016E 00000000 0000BFE4'
'COMM:iTunNORM:eng'                                 (' 0000016E 00000000 0000BFE4 00000000 00002AF5 00000000 0000940B 0000940B '
 '000E2729 000E2729')
'COMM:iTunes_CDDB_1:eng'                            '0203D301+73597+1+150'
'COMM:iTunes_CDDB_TrackNumber:eng'                  '1'
'TBPM' (BPM (beats per minute))                     '128.170'
'TCON' (Content type, a.k.a. Genre)                 'loc-unsorted'
'TENC' (Encoded by)                                 'iTunes v4.0'
'TIT2' (Title/songname/content description)         'Commentary on Ca Dao Collection'
'TKEY' (Initial key)                                '1A'
'TPE1' (Lead performer(s)/Soloist(s))               'John Balaban'
'TRCK' (Track number/Position in set)               '1/1'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'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'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.26 dB'
'TXXX:replaygain_track_peak'                        '0.973588'

========================== row from database ==========================
                                              'id'  431655
                                            'path'  /data/Music/Bulk/00localcharacter/Ca Dao： Vietnamese Folk Poems (1971-72) (UbuWeb)/mp3 [128k-160k]/ca-dao-commentary.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  979
                                           'genre'  loc-unsorted
                                        'filesize'  19589281
                                           'mtime'  1620400740
                                   'redo_metaread'  0
                                        'rest_str'   00localcharacter Dao： Vietnamese Folk Poems (1971 72) (UbuWeb) mp3 [128k 160k] ca dao commentary loc unsorted
                                      'tag_artist'  John Balaban
                                     'tag_release'  None
                                       'tag_title'  Commentary on Ca Dao Collection
                                             'bpm'  128.17
                                    'search_title'  'ca':3 'collection':5 'commentary':1 'dao':4 'on':2
                                   'search_artist'  'balaban':2 'john':1
                                  'search_release'  
                                     'search_rest'  '128k':14,15 '160k':16,17 '1971':7,8 '72':9,10 'ca':18 'commentary':19 'dao':1,2,3 'folk':5 'loc':20 'mp3':13 'poems':6 'ubu':22,23 'ubuweb':11,12 'unsorted':21 'vietnamese':4 'web':24,25
                                    'search_combo'  '128k':21,22 '160k':23,24 '1971':14,15 '72':16,17 'balaban':7B 'ca':3A,25 'collection':5A 'commentary':1A,26 'dao':4A,8,9,10 'folk':12 'john':6B 'loc':27 'mp3':20 'on':2A 'poems':13 'ubu':29,30 'ubuweb':18,19 'unsorted':28 'vietnamese':11 'web':31,32
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  1A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-1', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  []
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620400739.7289686  (2021-05-07 17:18:59)
                             'size'  19589281