Question: Which two men write the rock musical that Galt McDermot is known for?

Context paragraphs:
Galt MacDermot: Arthur Terence Galt MacDermot (born December 18, 1928) is a Canadian-American composer, pianist and writer of musical theatre.  He won a Grammy Award for the song "African Waltz" in 1960.  His most successful musicals have been "Hair" (1967; its cast album also won a Grammy) and "Two Gentlemen of Verona" (1971).  MacDermot has also written music for film soundtracks, jazz and funk albums, and classical music, and his music has been sampled in hit hip-hop songs and albums.  He is best known for his work on "Hair", and in particular three of the songs from the show; "Aquarius", "Let the Sunshine In", and "Good Morning Starshine", all three of which were number one hits in 1969.

Easy to Be Hard: "Easy to Be Hard" is a song from the rock musical "Hair".  It was written by Galt MacDermot, James Rado, and Gerome Ragni, who put the musical together in the mid-1960s.  The original recording of the musical featuring the song was released in May 1968 with the song being sung by Lynn Kellogg, who performed the role of Sheila on stage in the musical.  The song was first covered by American band Three Dog Night on their 1969 album "Suitable for Framing", with the lead vocal part sung by Chuck Negron, and was produced by Gabriel Mekler.

Via Galactica: Via Galactica is a rock musical with a book by Christopher Gore and Judith Ross, lyrics by Gore, and music by Galt MacDermot.  It marked the Broadway debut of actor Mark Baker.

Two Men of the Desert: Two Men of the Desert (also known as Two Men on the Desert and Two Men in a Desert) was a 1913 American silent Western short film written and directed by D. W. Griffith.  Based on a story by Jack London, the film was shot on location in Death Valley.  "Two Men of the Desert" is now presumed lost.

Rock musical: A rock musical is a musical theatre work with rock music.  The genre of rock musical may overlap somewhat with album musicals, concept albums and song cycles, as they sometimes tell a story through the rock music, and some album musicals and concept albums become rock musicals.  Notable examples of rock musicals include "Next to Normal", "Spring Awakening", "Rent", "Grease", and "Hair".  The Who's "Tommy" and other rock operas are sometimes presented on stage as a musical.

Lovelace: A Rock Musical: Lovelace: A Rock Musical is a rock musical about the life of adult film star and women's liberation advocate, Linda Lovelace.  The book, music, and lyrics are by Anna Waronker (that dog. ) and Charlotte Caffey (The Go-Go's), with original concept and lyrics by Jeffery Leonard Bowman.  The show debuted with a six-month run at the Hayworth Theatre (Los Angeles) in 2008.  A new production of "Lovelace: A Rock Musical" made its United Kingdom debut at The Edinburgh Festival Fringe  in August 2010.

Hair (musical): Hair: The American Tribal Love-Rock Musical is a rock musical with a book and lyrics by James Rado and Gerome Ragni and music by Galt MacDermot.  A product of the hippie counterculture and sexual revolution of the late 1960s, several of its songs became anthems of the anti-Vietnam War peace movement.  The musical's profanity, its depiction of the use of illegal drugs, its treatment of sexuality, its irreverence for the American flag, and its nude scene caused much comment and controversy.  The musical broke new ground in musical theatre by defining the genre of "rock musical", using a racially integrated cast, and inviting the audience onstage for a "Be-In" finale.

Dude (musical): Dude (The Highway Life) is a rock musical with a book and lyrics by Gerome Ragni and music by Galt MacDermot.  It is an allegory about good and evil, the conflict between mankind's creative and destructive urges, the power of love, and the joy to be found in simple pleasures.  Dude is an Everyman who loses his innocence and fights to regain it.

From Boys to Men: Gay Men Write About Growing Up: From Boys to Men: Gay Men Write About Growing Up (ISBN  ) is an anthology of essays about growing up gay.  It was edited by Ted Gideonse and Rob Williams and published by Carroll & Graf in 2006.

Two Gentlemen of Verona (musical): Two Gentlemen of Verona is a rock musical, with a book by John Guare and Mel Shapiro, lyrics by Guare and music by Galt MacDermot, based on the Shakespeare comedy of the same name.

Supporting paragraphs: Galt MacDermot Two Gentlemen of Verona (musical)
Answer: John Guare and Mel Shapiro