Slim Harpo (born James Isaac Moore, January 11, 1924 – January 31, 1970), 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 number one on Billboard‘s R&B chart and number 16 on its broader Hot 100 singles chart. He was a master of the blues harmonica, known in blues circles as a “harp”. Moore was born in Lobdell, Louisiana, the eldest child in his family. After his parents died he worked as a longshoreman and construction worker in New Orleans in the late 1930s and early 1940s. Influenced in style by Jimmy Reed, he began performing in Baton Rouge bars using the name “Harmonica Slim”, and also accompanied his brother-in-law Lightnin’ Slim in live performances.

He started his recording career in March 1957, working with the A&R man and record producer J. D. “Jay” Miller in Crowley, Louisiana. To differentiate himself from another performer called Harmonica Slim he took his wife’s suggestion and adopted the name Slim Harpo. His first solo release, for Excello Records, based in Nashville, Tennessee, was “I’m a King Bee“, backed with “I Got Love If You Want It” in 1957. Harpo played guitar in his live shows, but he usually used other guitarists when recording. The record was a regional hit, but failed to make the national charts. He followed up with several more singles for Excello before having his first chart hit, “Rainin’ in My Heart”, in early 1961. The record reached number 17 on Billboard‘s R&B chart and number 34 on its Hot 100, and it was followed soon after with an album of the same name and additional singles. Many of his songs were co-written with his wife, Lovelle Moore, although she never received credit.