James Isaac Moore (January 11, 1924 – January 31, 1970), known as Slim Harpo, was an American blues musician, a leading exponent of the swamp blues style, and "one of the most commercially successful blues artists of his day". His most successful and influential recordings included "I'm a King Bee" (1957), "Rainin' In My Heart" (1961), and "Baby Scratch My Back" (1966) which reached no.1 on the R&B chart and no.16 on the US pop chart. A master of the blues harmonica, his stage name was derived from the popular nickname for that instrument, the "harp".