《How Deep Is Your Love》is the soundtrack for the movie《Saturday Night Fever》. According to Wikipedia, 《Saturday Night Fever》 is a 1977 American dance film directed by John Badham and starring John Travolta as Tony Manero, an immature young man whose weekends are spent visiting a local Brooklyn discothèque; Karen Lynn Gorney as his dance partner and eventual friend; and Donna Pescow as Tony's former dance partner and would-be girlfriend.

While in the disco, Tony is the king. His care-free youth and weekend dancing help him to temporarily forget the reality of his life: a dead end job, clashes with his unsupportive and squabbling parents, racial tensions in the local community, and his associations with a gang of macho friends.

A huge commercial success, the film significantly helped to popularize disco music around the world and made Travolta, already well known from his role on TV's Welcome Back, Kotter, a household name. The Saturday Night Fever soundtrack, featuring disco songs by the Bee Gees, is one of the best selling soundtracks of all time. The film is the first example of cross-media marketing, with the tie-in soundtrack's single being used to help promote the film before its release and the film popularizing the entire soundtrack after its release. The film also showcased aspects of the music, the dancing, and the subculture surrounding the disco era: symphony-orchestrated melodies, haute-couture styles of clothing, pre-AIDS sexual promiscuity, and graceful choreography.