Leonard Chess changed the face of modern music, and he did so without playing a note. An immigrant living in Chicago just as the city was exploding with new blues sounds, he heard what few others did at the time: the universal passion in the music. Etta James, Muddy Waters and Bo Diddley all rose to fame thanks to Chess. At first with a nightclub and then with his legendary record label, Chess earned his place in American cultural history. This is his story, and it rocks.