HAIR is a musical written by James Rado and Gerome Ragni, which debuted on Broadway in 1968. It was one of the first rock musicals and was extremely popular during the 1960s. The musical follows a group of hippies in New York City who struggle to balance their ideals with the realities of life. The show's most famous song, 'Aquarius/Let the Sunshine In, ' became an anthem of the counterculture movement.