Ellas McDaniel (born Ellas Otha Bates, December 30, 1928 – June 2, 2008), known as Bo Diddley, was an American rhythm & blues and rock & roll singer, guitarist, songwriter and music producer. He is cited as a key figure in the transition of blues into rock and roll, by introducing more insistent, driving rhythms and a harder-edged guitar sound. His use of African rhythms and the signature "Bo Diddley beat", a simple five-accent hambone rhythm, is a cornerstone of r&b, rock, pop and hip hop.