Grease is a 1971 musical by Jim Jacobs and Warren Casey. The musical is named for the 1950s United States working-class youth subculture known as greasers. The musical, set in 1959 at fictional Rydell High School, follows ten working-class teenagers as they navigate the complexities of love. The score attempts to recreate the sounds of early 1950's rock and roll. In its record-breaking original Broadway production, Grease was a raunchy, raw, aggressive, vulgar show. Subsequent productions sanitized it and tamed it down. The show tackles such social issues as teenage pregnancy and gang violence; its themes include love, friendship, teenage rebellion, sexual exploration during adolescence, and, to some extent, class consciousness/class conflict.
Grease was first performed in 1971 in the original Kingston Mines Theater in Chicago, located in an old trolley barn. From there, it has been successful on both stage and screen, but the content has been diluted and its teenage characters have become less Chicago habitués and more generic.