The term FAMOUS ROCK MUSICAL can be solved by the four letter word HAIR. HAIR is a rock musical written by James Rado and Gerome Ragni, which debuted off-Broadway in 1967. It tells the story of a group of hippies living in New York City during the Vietnam War era, and their struggle to balance their lives with their ideals. The musical was made into a film in 1979, and has since become a classic of the genre.