How many movies have Giuseppe Verdi and Piero Cappuccilli collaborated on?

They have worked on 4 movies together! Their first movie together was Verdi Un Ballo in Maschera (1975) while their highest rated movie together was Il Trovatore - Verdi (1978). They have not worked together since Verdi: Simon Boccanegra (1985). They are most known for their music films together.