======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '63'
                                          'artist'  'Kelpe'
                                     'text_people'  ''
                                         'release'  'Cambio Wechsel'
                                           'title'  'Caution Site'
                                           'quals'  "['q-bass-2', 'q-drums-4', 'q-other-3', 'q-piano-1', 'q-vocals-2']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '07'
                                      'tracktotal'  ''
                                            'date'  '2009'
                                        'comments'  ''
                                           'genre'  'IDM'
                                             'bpm'  '98.2'
                                             'key'  '3A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'COMM:iTunNORM:eng'                                 (' 000003FA 0000038A 00003F65 00008D7F 0000A8C6 00009D8D 00005E38 0000624C '
 '00008BB1 00002ED6')
'COMM:iTunPGAP:eng'                                 '0'
'COMM:iTunSMPB:eng'                                 (' 00000000 00000210 00000AA4 00000000002AC9CC 00000000 0026BA4A 00000000 '
 '00000000 00000000 00000000 00000000 00000000')
'COMM:iTunes_CDDB_IDs:eng'                          '12+4A3A69303E497ABC4AE6B3A75F7FDC6D+13752891'
'TALB' (Album/Movie/Show title)                     'Cambio Wechsel'
'TBPM' (BPM (beats per minute))                     '98.2'
'TCON' (Content type, a.k.a. Genre)                 'IDM'
'TDRC' (Recording time)                             '2009'
'TENC' (Encoded by)                                 'iTunes 8.0.2.20'
'TIT2' (Title/songname/content description)         'Caution Site'
'TKEY' (Initial key)                                '3A'
'TPE1' (Lead performer(s)/Soloist(s))               'Kelpe'
'TRCK' (Track number/Position in set)               '07'
'TXXX:q-bass'                                       '2'
'TXXX:q-drums'                                      '4'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '2'

========================== row from database ==========================
                                              'id'  1538782
                                            'path'  /data/Music/Other/PrevSet/[6calmer]/Kelpe/Cambio Wechsel/07. Caution Site.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  63
                                           'genre'  IDM
                                        'filesize'  2742026
                                           'mtime'  1662800439
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [6calmer] 07. IDM
                                      'tag_artist'  Kelpe
                                     'tag_release'  Cambio Wechsel
                                       'tag_title'  Caution Site
                                             'bpm'  98.2
                                    'search_title'  'caution':1 'site':2
                                   'search_artist'  'kelpe':1
                                  'search_release'  'cambio':1 'wechsel':2
                                     'search_rest'  '07':4,5 '6calmer':2,3 'idm':6 'prev':7 'prevset':1 'set':8
                                    'search_combo'  '07':9,10 '6calmer':7,8 'cambio':4C 'caution':1A 'idm':11 'kelpe':3B 'prev':12 'prevset':6 'set':13 'site':2A 'wechsel':5C
                                    'tag_tracknum'  7
                                      'num_images'  1
                                             'key'  3A
                                           'quals'  ['q-bass-2', 'q-drums-4', 'q-other-3', 'q-piano-1', 'q-vocals-2']
                                      'lastfmtags'  []
                                        'tag_date'  2009
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800438.6804526  (2022-09-10 11:00:38)
                             'size'  2742026