How many movies have Luigi Illica and Umberto Giordano collaborated on?

They have worked on 7 movies together! Their first movie together was Del Monaco: Andrea Chenier (1961) while their highest rated movie together was Giordano: Andrea Chernier (2015). They have not worked together since Giordano: Andrea Chénier - Teatro alla Scala (2017). They are most known for their music films together.