Question: What Monty Python musical comedy did Micheal McGrath appear in?

Context paragraphs:
The Ministry of Silly Walks: "The Ministry of Silly Walks" is a sketch from the Monty Python comedy troupe's television show "Monty Python's Flying Circus", season 2, episode 1, which is entitled "Face the Press".  The episode first aired at some point in 1970.  A shortened version of the sketch was performed for "Monty Python Live at the Hollywood Bowl".  This sketch involves John Cleese as a bowler-hatted civil servant in a fictitious British government ministry responsible for developing silly walks through grants.  Cleese, throughout the sketch, walks in a variety of silly ways.  It is these various silly walks, more than the dialogue, that has earned the sketch its popularity.  Cleese has cited the physical comedy of Max Wall, probably in character as Professor Wallofski, as important to its conception.

Monty Python's Flying Circus: Monty Python’s Flying Circus (known during the final series as just Monty Python) is a British sketch comedy series created by the comedy group Monty Python and broadcast by the BBC from 1969 to 1974.  The shows were composed of surreality, risqué or innuendo-laden humour, sight gags and observational sketches without punchlines.  It also featured animations by group member Terry Gilliam, often sequenced or merged with live action.  The first episode was recorded on 7 September and premiered on 5 October 1969 on BBC One, with 45 episodes airing over four series from 1969 to 1974, plus two episodes for German TV.

Spamalot: Monty Python's Spamalot is a musical comedy adapted from the 1975 film "Monty Python and the Holy Grail".  Like the film, it is a highly irreverent parody of the Arthurian Legend, but it differs from the film in many ways.  The original 2005 Broadway production, directed by Mike Nichols, won three Tony Awards, including the Tony Award for Best Musical, and received 14 Tony Award nominations.  During its initial run of over 1,500 performances, it was seen by more than two million people and grossed over $175 million.

Michael McGrath (actor): Michael McGrath (born September 25, 1957) is a Tony Award-winning American stage actor.  He has appeared in many Broadway stage productions, and is especially noted for his roles in the musicals "Spamalot" and "Nice Work If You Can Get It".

John Cleese: John Marwood Cleese ( ; born 27 October 1939) is an English actor, voice actor, screenwriter, producer, and comedian.  He achieved success at the Edinburgh Festival Fringe and as a scriptwriter and performer on "The Frost Report".  In the late 1960s, he co-founded Monty Python, the comedy troupe responsible for the sketch show "Monty Python's Flying Circus" and the four Monty Python films: "And Now for Something Completely Different", "Monty Python and the Holy Grail", "Life of Brian" and "The Meaning of Life".

Never Be Rude to an Arab: "Never Be Rude to an Arab" is a satirical song by the members of "Monty Python's Flying Circus", originally appearing on the 1980 album "Monty Python's Contractual Obligation Album".  It appears as sung by Terry Jones in the theatrically released concert film "Monty Python Live at the Hollywood Bowl" and was included on the compilation album "Monty Python Sings".

I've Got Two Legs: "I've Got Two Legs" is a song by the British comedy troupe Monty Python that was composed by Terry Gilliam.  It most prominently appears in the concert film "Monty Python Live at the Hollywood Bowl", the concert LP "Monty Python Live at Drury Lane" and the album "Monty Python Sings".  It also appeared at the 2014 reunion shows in O2 Arena titled "Monty Python Live".

Python Night – 30 Years of Monty Python: Python Night was an evening of Monty Python related programmes broadcast on BBC2 on 9 October 1999, to celebrate the 30th anniversary of the first broadcast of "Monty Python's Flying Circus".  It featured newly written sketches, three documentaries and a screening of "Monty Python's Life of Brian".

The Instant Monty Python CD Collection: The Instant Monty Python CD Collection is a box set released in 1994 of six CDs containing eight albums by the Monty Python troupe.  It does not include the first Monty Python record, "Monty Python's Flying Circus", whose rights are still owned by the BBC.

Ian MacNaughton: Edward Ian Macnaughton (30 December 1925 – 10 December 2002) was a Scottish actor-turned-television producer and director, best known for his work with the "Monty Python" team.  MacNaughton was director and producer for all but four of the forty five episodes of "Monty Python's Flying Circus" from 1969 to 1974, director of the group's first feature film "And Now for Something Completely Different" in 1971 and director of their two German episodes, "Monty Python's Fliegender Zirkus" in 1971 and 1972.  In 1973 the production team shared the BAFTA Award for Best Light Entertainment Programme for "Monty Python's Flying Circus".

Supporting paragraphs: Michael McGrath (actor) Spamalot
Answer: "Spamalot"