It became most famous in 1942 when part of it was sung by the character Sam (Dooley Wilson) in the movie Casablanca. The song was voted No. 2 on the AFI's 100 Years...100 Songs special, commemorating the best songs in film. It has been used as a fanfare for Warner Bros. Pictures since 1999 and was the title and theme song of the 1990s British comedy series As Time Goes By. The original song referred to Albert Einstein's concept of time as a fourth dimension, but this connection was lost by the omission of the first verse in most performances, as detailed below.
You must remember this A kiss is still a kiss, a sigh is just a sigh The fundamental things apply As time goes by
And when two lovers woo They still say "I love you", on that you can rely No matter what the future brings As time goes by
Moonlight and love songs, never out of date Hearts full of passion, jealousy, and hate Woman needs man and man must have his mate That no one can deny
It's still the same old story A fight for love and glory, a case of do or die The world will always welcome lovers As time goes by