Original songs from (non-musical) movies that are part of the plot

[John_Bredin]

@Annie-Xmas

While thinking of this category, you must remember this movie: Casablanca

Well, as time goes by, we must remember that:
[QUOTE=Wikipedia]
Herman Hupfeld wrote “As Time Goes By” for the 1931 Broadway musical Everybody’s Welcome.
[/QUOTE]