How many movies have Arturo Toscanini and Don Gillis collaborated on?

They have worked on 7 movies together! Their first movie together was Toscanini: The Television Concerts, Vol. 1: Wagner (1948) and was their highest rated movie together. They have not worked together since Toscanini: The Television Concerts, Vol. 7: Wagner (1951). They are most known for their music films together.