How many movies have Ennio Morricone and Giovanni Morricone collaborated on?

They have worked on 5 movies together! Their first movie together was A Pure Formality (1994) while their highest rated movie together was Ennio Morricone: Peace Notes - Live in Venice (2007). They have not worked together since Ennio Morricone: Peace Notes - Live in Venice (2007). They are most known for their music films together.