How many movies have Euclid James 'Motorhead' Sherwood and Ian Underwood collaborated on?

They have worked on 3 movies together! Their first movie together was 200 Motels (1971) while their highest rated movie together was Eat That Question: Frank Zappa in His Own Words (2016). They have not worked together since Eat That Question: Frank Zappa in His Own Words (2016).