Which musical features the song "Let the Sunshine In"?

"Hair," which opened on Broadway in 1968, featured "Let the Sunshine In" as its rousing finale number. The musical's creators James Rado and Gerome Ragni actually wrote most of the songs while hanging out in Greenwich Village coffee shops, absorbing the hippie culture they would later immortalize on stage. The song became such a huge hit that the Fifth Dimension's pop version spent 16 weeks on the Billboard charts (six at #1) without most radio listeners realizing it came from a show about draft-dodging hippies.