How many movies have Anna Netrebko and Felice Romani collaborated on?

They have worked on 4 movies together! Their first movie together was Donizetti: L'elisir d'amore (2005) while their highest rated movie together was The Metropolitan Opera: L'Elisir d'Amore (2012). They have not worked together since The Metropolitan Opera: L'Elisir d'Amore (2012). They are most known for their music films together.