code: def _result_is_match(self, result, title, artist=None):
          
          result_title = self._clean_str(result['title'])
          title_is_match = result_title == self._clean_str(title)
          if not artist:
              return title_is_match
          result_artist = self._clean_str(result['primary_artist']['name'])
          return title_is_match and result_artist == self._clean_str(artist)
docs: Returns True if search result matches searched song