Amy Paulette "Amii" Stewart (born January 29, 1956) is an American disco and soul singer and dancer who found prominence with her 1979 U.S. Billboard number 1 hit cover of Eddie Floyd's song "Knock on Wood", often considered a classic of the disco genre. Stewart scored further international hits including "Light My Fire" (1979) and "Friends" (1985). Stewart is the stepsister of actress-singer Miquel Brown and aunt to Brown's actress-singer daughter Sinitta. Amy Stewart, the fifth of six childre ...