Something's Coming...West Side Story. Leonard Bernstein, music and I think Sondheim penned the lyrics.
Leonard Bernstein trivia. People always mispronounced his last name, they would say Bern-steen. He would correct them thusly: "It's Bern-Stein..like the piano, STEINWAY! I love that story, but then I loved Bernstein, another brilliant Brooklyn native.