"As Time Goes By" is a jazz song written by Herman Hupfeld in 1931. It became famous when it featured in the 1942 film Casablanca, performed by Dooley Wilson as Sam. The song was voted No. 2 on the AFI's 100 Years...100 Songs special, commemorating the best songs in film.

Casablanca is a 1942 American romantic drama film directed by Michael Curtiz and starring Humphrey Bogart, Ingrid Bergman, and Paul Henreid. Filmed and set during World War II, it focuses on an American expatriate (Bogart) who must choose between his love for a woman (Bergman) and helping her husband (Henreid), a Czechoslovak resistance leader, escape from the Vichy-controlled city of Casablanca to continue his fight against the Germans. The screenplay is based on Everybody Comes to Rick's, an unproduced stage play by Murray Burnett and Joan Alison. The supporting cast features Claude Rains, Conrad Veidt, Sydney Greenstreet, Peter Lorre, and Dooley Wilson.