Bo Diddley

Bo Diddley (December 30, 1928 – June 2, 2008) was an American rock and roll singer, songwriter, and guitarist. Often cited as a key figure in the transition from blues to rock and roll, he introduced more insistent, driving rhythms and a hard-edged guitar sound. He was also known for his characteristic rectangular guitar.

and if you don't remember this..here's the old Nike Bo Jackson commercial too.