How many movies have Gert Wilden and Karl Heinz Busse collaborated on?

They have worked on 4 movies together! Their first movie together was Wenn die Musik spielt am Wörthersee (1962) while their highest rated movie together was Tausend Takte Übermut (1965). They have not worked together since Tausend Takte Übermut (1965). They are most known for their music films together.