How many movies have Gus Backus and Karl Heinz Busse collaborated on?

They have worked on 6 movies together! Their first movie together was Übermut im Salzkammergut (1963) while their highest rated movie together was The Merry Girls of Tyrol (1964). They have not worked together since Ich kauf mir lieber einen Tirolerhut (1965). They are most known for their music films together.