How many movies have Christa Ludwig and Wiener Philharmoniker acted in together?

They have worked on 3 movies together! Their first movie together was Così fan tutte (1970) while their highest rated movie together was Mahler - Symphonies Nos. 1, 2 & 3 (1973). They have not worked together since Bernstein Mahler Rehearsal (1976). They are most known for their music films together.