Question: This Is Spinal Tap co-starred which actor known for his voice work on The Simpsons?

<P0-S0> Michael John McKean (born October 17, 1947) is an American actor, comedian, and musician, known for a variety of roles played since the 1970s. <P0-S1>  He first came to national attention playing annoying neighbor Lenny Kosnowski on the sitcom "Laverne & Shirley". <P0-S2>  In the mid-1990s he was a repertory cast member of "Saturday Night Live". <P0-S3>  He has played roles in several Christopher Guest ensemble films, particularly as David St. Hubbins, lead vocalist and rhythm guitarist of the fictional rock band Spinal Tap in "This Is Spinal Tap". <P0-S4>  He co-wrote the song "A Mighty Wind" (from the film of the same name), which won a Grammy Award, as well as "A Kiss at the End of the Rainbow" from the same film, which was nominated for the Academy Award for Best Song. <P0-S5>  He plays Chuck McGill, brother of the protagonist of the AMC drama "Better Call Saul". <SEP> <P1-S0> 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. <P1-S1>  The film portrays the fictional British heavy metal band Spinal Tap. <P1-S2>  The film satirizes the wild personal behavior and musical pretensions of hard rock and heavy metal bands, as well as the hagiographic tendencies of rock documentaries of the time. <P1-S3>  The three main members of Spinal Tap—David St. Hubbins, Derek Smalls and Nigel Tufnel—are played by actors McKean, Shearer, and Guest, respectively. <P1-S4>  The three actors play their musical instruments and speak with mock English accents throughout the movie. <P1-S5>  Reiner appears as Marty Di Bergi, the maker of the documentary. <P1-S6>  Other actors in the movie are Tony Hendra as group manager Ian Faith, and June Chadwick as St. Hubbins' interfering girlfriend Jeanine. <P1-S7>  Actors Paul Shaffer, Fred Willard, Fran Drescher, Bruno Kirby, Howard Hesseman, Ed Begley, Jr., Patrick Macnee, Anjelica Huston, Vicki Blue, Dana Carvey, Billy Crystal and Linnea Quigley all play supporting roles or make cameo appearances in the movie. <SEP> <P2-S0> Harry Julius Shearer (born December 23, 1943) is an American actor, voice actor, comedian, writer, musician, author, radio host, director and producer. <P2-S1>  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". <P2-S2>  Born in Los Angeles, California, Shearer began his career as a child actor. <P2-S3>  From 1969 to 1976, Shearer was a member of The Credibility Gap, a radio comedy group. <P2-S4>  Following the breakup of the group, Shearer co-wrote the film "Real Life" with Albert Brooks and started writing for Martin Mull's television series "Fernwood 2 Night". <SEP> <P3-S0> Robert Leighton is a British film and television editor with more than 30 feature film credits since 1980. <P3-S1>  He has edited nearly all of the films by film director Rob Reiner, commencing with "This is Spinal Tap" in 1984. <P3-S2>  He has also edited three films with Christopher Guest. <P3-S3>  His work includes hit comedies and mockumentaries such as "This is Spinal Tap", "Best in Show" and "When Harry Met Sally" as well as classic dramas such as "Stand by Me" and the Stephen King thriller, "Misery", which garnered actress Kathy Bates a "Best Actress" Oscar. <P3-S4>  He was nominated for the Academy Award for Best Film Editing for the feature film, "A Few Good Men" (1992).