Premise: "If Ever I See You Again" is the title of a 1978 hit single by Roberta Flack. The song was composed by Joseph "Joe" Brooks and served as the title song for the eponymous 1978 film "If Ever I See You Again" that Brooks directed and also starred in with Shelley Hack as his leading lady. Male vocalist Jamie Carr sang the theme song on the film's soundtrack.
Hypothesis: "If I Ever See You Again" was sung by both Flack and Carr.