======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '290'
                                          'artist'  'Don Caballero'
                                     'text_people'  ''
                                         'release'  'World Class Listening Problem'
                                           'title'  'World Class Listening Problem'
                                           'quals'  ("['Q-OLDST-3', 'Q-JZFKS-1', 'Q-UNU-2', 'Q-HHRNBTT-1', 'Q-LOCALNESS-1', "
 "'q-syn-2', 'q-bass-4', 'q-busy-3', 'q-grit-2', 'q-play-3', 'q-chart-3', "
 "'q-drums-3', 'q-other-3', 'q-piano-1', 'q-vocals-1', 'q-mixbeat-2']")
                                      'lastfmtags'  "['math rock', 'instrumental', 'progressive rock', 'post rock', 'experimental']"
                                     'discogstags'  "['rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '6'
                                      'tracktotal'  '10'
                                            'date'  '2006'
                                        'comments'  ''
                                           'genre'  'rock-unsorted;set-pl-sced'
                                             'bpm'  '89.060'
                                             'key'  '10B'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'COMM:ID3v1 Comment:XXX'                            ' 000018D5 000015F5 00007420'
'COMM:iTunNORM:eng'                                 (' 000018D5 000015F5 00007420 00008722 000405E5 00040F49 000087A8 000089ED '
 '0002CF49 0002CE43')
'COMM:iTunSMPB:eng'                                 (' 00000000 00000210 0000087C 0000000000C3A7F4 00000000 00000000 00000000 '
 '00000000 00000000 00000000 00000000 00000000')
'COMM:iTunes_CDDB_IDs:eng'                          '10+C94E9C0E4BC8645A276AAD5331FB1B59+7069356'
'TALB' (Album/Movie/Show title)                     'World Class Listening Problem'
'TBPM' (BPM (beats per minute))                     '89.060'
'TCON' (Content type, a.k.a. Genre)                 ['rock-unsorted', 'set-pl-sced']
'TDRC' (Recording time)                             '2006'
'TENC' (Encoded by)                                 'iTunes v6.0.0.18'
'TIT2' (Title/songname/content description)         'World Class Listening Problem'
'TKEY' (Initial key)                                '10B'
'TPE1' (Lead performer(s)/Soloist(s))               'Don Caballero'
'TPE2' (Band/orchestra/accompaniment)               'Don Caballero'
'TRCK' (Track number/Position in set)               '6/10'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '2'
'TXXX:discogstags'                                  'rock'
'TXXX:lastfmtags'                                   ['math rock', 'instrumental', 'progressive rock', 'post rock', 'experimental']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '-0.53 dB'
'TXXX:replaygain_track_peak'                        '0.389340'

========================== row from database ==========================
                                              'id'  1334540
                                            'path'  /data/Music/Bulk/00poprockelectronic/Don Caballero/[2006] World Class Listening Problem/06 World Class Listening Problem.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  290
                                           'genre'  rock-unsorted;set-pl-sced
                                        'filesize'  11696231
                                           'mtime'  1620389568
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic [2006] 06 rock unsorted;set pl sced
                                      'tag_artist'  Don Caballero
                                     'tag_release'  World Class Listening Problem
                                       'tag_title'  World Class Listening Problem
                                             'bpm'  89.06
                                    'search_title'  'class':2 'listening':3 'problem':4 'world':1
                                   'search_artist'  'caballero':2 'don':1
                                  'search_release'  'class':2 'listening':3 'problem':4 'world':1
                                     'search_rest'  '00poprockelectronic':1 '2006':2,3 'pl':9 'rock':4 'sced':10 'set':6,8 'unsorted':5,7
                                    'search_combo'  '00poprockelectronic':11 '2006':12,13 'caballero':6B 'class':2A,8C 'don':5B 'listening':3A,9C 'pl':19 'problem':4A,10C 'rock':14 'sced':20 'set':16,18 'unsorted':15,17 'world':1A,7C
                                    'tag_tracknum'  6
                                      'num_images'  1
                                             'key'  10B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-3', 'q-syn-2', 'q-chart-3', 'q-other-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['math rock', 'instrumental', 'progressive rock', 'post rock', 'experimental']
                                        'tag_date'  2006
                                     'discogstags'  ['rock']

============================== file details ==============================
                                           'mtime'  1620389567.8082697  (2021-05-07 14:12:47)
                             'size'  11696231