That was my main problem. I read somewhere once that while Verdi was working on Il Trovatore, he said (or wrote) that he wanted every organ grinder in Italy to be playing a tune from Trovatore. His pop opera, I guess. But obviously that was not what he had in mind for Falstaff...I can't remember a single melody. Why people consider this opera superior to Rigoletto or Traviata or even Aida beats me.