John "Memphis Slim" Chatman (born September 3, 1915, Memphis, Tennessee; died February 24, 1988, in Paris, France) was a blues pianist, singer, and composer. He led a series of bands that, reflecting the popular appeal of jump-blues, included saxophones, bass, drums, and piano. His 1952 composition "Every Day I Have the Blues" was recorded by Joe Williams, and Lowell Fulson, B. B. King, Ray Charles, Eric Clapton, Natalie Cole, Ella Fitzgerald, Jimi Hendrix, Mahalia Jackson, Sarah Vaughan, Carlos Santana, Lou Rawls, to name a few. He cut over 500 recordings and influenced blues pianists that followed him for decades.