What made this song famous is its key role in the relationship between Rick (Humphrey Bogart) and Ilsa (Ingrid Bergman). The often misquoted line “Play It Again Sam” is from Casablanca and refers to this song which is played by Sam (Dooley Wilson).
Here’s an excerpt from the lyrics, which contain the song title:
You must remember this:
A kiss is just 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 .Moonlight an’ love songs never out of date,
Hearts full of passion, jealousy an’ 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 an’ glory,
A case of do or die, the world will always welcome lovers,
As time goes by . . .
The song is also nicely revived and used in the 90’s hit Sleepless in Seattle.