Question: What is the title of this mockumentary film that Fred Willard, Christopher Guest, and Rob Reiner were involved with?

<P0-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. <P0-S1>  The film portrays the fictional British heavy metal band Spinal Tap. <P0-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. <P0-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. <P0-S4>  The three actors play their musical instruments and speak with mock English accents throughout the movie. <P0-S5>  Reiner appears as Marty Di Bergi, the maker of the documentary. <P0-S6>  Other actors in the movie are Tony Hendra as group manager Ian Faith, and June Chadwick as St. Hubbins' interfering girlfriend Jeanine. <P0-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> <P1-S0> Christopher Haden-Guest, 5th Baron Haden-Guest (born February 5, 1948), simply known as Christopher Guest, is an English-American screenwriter, composer, musician, director, actor, and comedian who holds dual British and American citizenship. <P1-S1>  Guest is most widely known in Hollywood for having written, directed and starred in his series of comedy films shot in mock-documentary (mockumentary) style. <P1-S2>  Many scenes and character backgrounds in Guest's films are written and directed, although actors have no rehearsal time and the ensemble improvise scenes while filming them. <P1-S3>  The series of films began with "This Is Spinal Tap" (directed by Rob Reiner), and continued with "Waiting for Guffman", "Best In Show", "A Mighty Wind", "For Your Consideration", and "Mascots". <SEP> <P2-S0> Mascots is a 2016 mockumentary from Christopher Guest that premiered on Netflix on October 13, 2016, featuring Guest, Jane Lynch, Parker Posey, Fred Willard, Ed Begley, Jr., Christopher Moynihan, Don Lake, Zach Woods, Chris O'Dowd, Bob Balaban, and Jennifer Coolidge. <SEP> <P3-S0> Frederick Charles "Fred" Willard (born September 18, 1939) is an American actor, comedian, voice actor and writer, best known for his improvisational comedy. <P3-S1>  He is known for his roles in the Rob Reiner mockumentary film "This Is Spinal Tap", the Christopher Guest mockumentary films "Waiting for Guffman", "Best in Show", "A Mighty Wind", "For Your Consideration", and "Mascots", and the "" films. <P3-S2>  He is an alumnus of The Second City. <P3-S3>  He received three Emmy nominations for his recurring role on the TV series "Everybody Loves Raymond" as Robert Barone's father-in-law, Hank MacDougall. <P3-S4>  In 2010 he received an Emmy nomination for Outstanding Guest Actor in a Comedy Series for his role on the ABC TV series "Modern Family" as Phil Dunphy's father, Frank Dunphy.