West Side Story is an American musical with a book by Arthur Laurents, music by Leonard Bernstein, lyrics by Stephen Sondheim, and conception and choreography by Jerome Robbins. It was inspired by William Shakespeare's play Romeo and Juliet.
Set in New York City in the mid-1950s, the musical explores the rivalry between the Jets and the Sharks, two teenage street gangs of different ethnic backgrounds. The members of the Sharks from Puerto Rico are taunted by the Jets, a white working-class group. The young protagonist, Tony, one of the Jets, falls in love with Maria, the sister of Bernardo, the leader of the Sharks. The dark theme, sophisticated music, extended dance scenes, and focus on social problems marked a turning point in American musical theatre. Bernstein's score for the musical has become extremely popular; it includes "Something's Coming", "Maria", "America", "Somewhere", "Tonight", "Jet Song", "I Feel Pretty", "A Boy Like That", "One Hand, One Heart", "Gee, Officer Krupke", and "Cool".