How many movies have Joni Mitchell and Neil Young acted in together?

They have worked on 4 movies together! Their first movie together was Crosby, Stills, Nash & Young - Live in Wembley 1974 (1974) while their highest rated movie together was The Best of The Johnny Cash TV Show 1969-1971 (2007). They have not worked together since Acoustic at the BBC (2011). They are most known for their music films together.