Written by Barry Gibb and first recorded by Frankie Valli in 1978, “Grease” serves as the bookend theme for the film adaptation of the earlier stage story, framing its return to 1950s youth culture and the greaser code. Its rock‑pop sheen and tight vocal phrasing link it to Valli’s Four Seasons lineage while translating that sound for late‑’70s radio. In New York, *Grease*’s stage life helped keep doo‑wop nostalgia in circulation long after its original era. Heard live at NJPAC, the song reads less as character study than as a slogan set to a hook, and that bluntness is part of its staying power.