As Time Goes By

As Time Goes By was an Earth song dating back to the early 1940s. It is best remembered for being performed in the classic motion picture Casablanca. The Doctor was fond of this song, and was heard crooning it during a visit to Terra Alpha. (DW: The Happiness Patrol)

Behind the scenes
As Time Goes By was also the title of a long-running romantic comedy television series of the 1990s starring Judi Dench and Geoffrey Palmer.