Arthur "Big Boy" Crudup

Arthur "Big Boy" Crudup (August 5, 1905 — March 28, 1974) was a delta blues singer and guitarist. He is best known outside blues circles for writing songs later covered by Elvis Presley and dozens of other artists, such as "That's All Right" (1946)[1], "My Baby Left Me" and "So Glad You're Mine."

Details: http://en.wikipedia.org/wiki/Arthur_%22Big_Boy%22_Crudup