Night Fever was written and performed by the Bee Gees for the 1977 film Saturday Night Fever, starring John Travolta, and became one of the defining songs of the disco era. Released as part of a soundtrack that dominated charts around the world, its falsetto vocals and driving beat helped make disco a mainstream cultural moment. Decades later, the track still appears in films, adverts and social videos whenever creators want an immediate shorthand for seventies style, confidence and dancing.