Conversation so far:
who wrote can't help falling in love
Can't Help Falling in Love was written by Hugo Peretti, Luigi Creatore, and George David Weiss.
was can't help falling in love in any movies
Can't Help Falling in Love was featured in Elvis Presley's 1961 film Blue Hawaii.

Question: what was the song based on
Self-contained rewrite: what was the song can't help falling in love based on