Grease is a musical by Jim Jacobs and Warren Casey. It takes its name from the 1950s United States working class youth subculture known as the greasers. The musical, set in 1959 in fictional Rydell High in Chicago, focuses on the romance between high schoolers Danny Zuko and Sandy Dumbrowski and tackles such social issues as teenage pregnancy and gang violence. Themes include love, friendship, teenage rebellion, sexual exploration during adolescence. The show's score celebrates '50s rock and roll as well as doo-wop and other contemporary styles.