As a composer he wrote in many styles, including symphonic and orchestral music, ballet, film and theatre music, choral works, opera, chamber music and works for the piano. His best-known work is the Broadway musical "West Side Story", which continues to be regularly performed worldwide, and was made into an Academy Award-winning feature film. His works include three symphonies, "Chichester Psalms", "Serenade after Plato's "Symposium"", the original score for the film "On the Waterfront", and theater works including "On the Town", "Wonderful Town", "Candide", and his "MASS".