The story of a deadly bar fight between a guy named Billy and a guy named Stagolee (or Stack Lee, or Stagger Lee) has worked its way into a broad swath of 20th-century music — from the blues of 1930s Southern prisoners, to Duke Ellington, to James Brown, to the Grateful Dead. At Davey D’s Hip Hop History 101, Cecil Brown traces the true story behind the legend back to the red light district of St. Louis in 1895.