How many movies have Alison Krauss and Emmylou Harris acted in together?

They have worked on 4 movies together! Their first movie together was Nanci Griffith: Other Voices, Other Rooms (1993) while their highest rated movie together was The Chieftains: Down The Old Plank Road -The Nashville Sessions in Concert (2003). They have not worked together since The Life & Songs of Emmylou Harris (2016). They are most known for their music films together.