Four DIFFERENT songs have charted with that title, so there's no easy answer to your question. Here they are starting with the earliest chart:
Joe Simon-1972
Huey Lewis and the News-1985
Laura Branigan-1988 (Covered by Celine Dion-1994
Luther Vandross-1991
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huey Lewis, Jennifer rush, ceyline dionne, Luther vandross and deeelite all sang the power of love
Gary Barlow, the power behind the throne in Take That; what a talent
did roberta flack sang this will be the first time any one has love me
Labri Sifre
There is a song in the VeryPoter Musical. Ron and Mouthboy sing I`m falling in love with herminie Granger.
Elvis Presley