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”. He played guitar and was a master of the blues harmonica, known in blues circles as a “harp”. 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.

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.