Ca n't Help Falling in Love '' is a pop ballad based on the song Plaisir d'amour .
'' Ca n't Help Falling in Love '' is a pop ballad based on `` Plaisir d'amour '' which is sung by Montgomery Clift in the 1949 film `` The Heiress '' starring Clift and Olivia de Havilland musical score provided by Aaron Copeland .
Can't Help Falling in Love