How many movies have Anatoli Kotscherga and Modeste Moussorgsky collaborated on?

They have worked on 3 movies together! Their first movie together was Boris Godunov [Salzburger Festpielhaus] (1998) and was their highest rated movie together. They have not worked together since Mussorgsky: Khovanshchina (2012). They are most known for their music films together.