How many movies have Gary Halvorson and Peter Mumford collaborated on?

They have worked on 4 movies together! Their first movie together was Britten: Peter Grimes (2008) while their highest rated movie together was The Metropolitan Opera - Puccini: Madama Butterfly (2016). They have not worked together since The Metropolitan Opera - Puccini: Madama Butterfly (2016). They are most known for their music films together.