How many movies have Ennio Morricone and Mahnahén Velasco collaborated on?

They have worked on 4 movies together! Their first movie together was A Pistol for Ringo (1965) while their highest rated movie together was The Forbidden Photos of a Lady Above Suspicion (1970). They have not worked together since The Forbidden Photos of a Lady Above Suspicion (1970). They are most known for their western films together.