Arthur Crudup, who wrote That's Alright Mama, which launched Elvis Presley along with My Baby Left and So Glad You're Mine which Presley covered. Arthur Crudup played at the Lanch in 1971
as part of the blues show - Priory Street Blues.
Arthur "Big Boy" Crudup was an American Delta blues singer, songwriter and guitarist. He is best known outside blues circles for writing songs such as "That's All Right", "My Baby Left Me" and "So Glad ... Wikipedia