How many movies have Gaetano Donizetti and Giovanni Ruffini collaborated on?

They have worked on 8 movies together! Their first movie together was Don Pasquale (1940) while their highest rated movie together was Don Pasquale - Palais Garnier (2018). They have not worked together since Donizetti: Don Pasquale (2018). They are most known for their music films together.