This Is Spinal Tap co-starred which actor known for his voice work on The Simpsons?
This Is Spinal Tap: This Is Spinal Tap (stylized as This Is Spın̈al Tap) is a 1984 American rock music mockumentary comedy film directed, co-written, scored by, and starring Rob Reiner, and co-starring Christopher Guest, Michael McKean and Harry Shearer. Harry Shearer: Harry Julius Shearer (born December 23, 1943) is an American actor, voice actor, comedian, writer, musician, author, radio host, director and producer. Harry Shearer:  He is known for his long-running roles on "The Simpsons", his work on "Saturday Night Live", the comedy band Spinal Tap and his radio program "Le Show".
Harry Julius Shearer