elif cat in self.radio:
                grp = "radio"
                url = self.api_radio % cat.lower().replace(" ","").replace("&","")
            else:
                return []
                
            # retrieve API data
            data = http.ajax(url, None)
            data = http.get(url, params=None, ajax=1)
            data = json.loads(data)
                
            # tranform datasets            
            if grp == "podcast":
                return [{
                    "genre": cat,
                    "title": row["titel"],