 This is American Roots following how rhythm and blues became rock and roll as black and white audiences desegregated concerts after hearing their favorite artists on records and the radio. A few shows ago, we played Milk Cow Blues, a popular song in Texas Western swing music. That led us back to a Delta Blues version by Robert Johnson from Hazlehurst, Mississippi. Here's an artist from Mississippi, Tupelo, with his 1955 breakout on Sun Records.