Nadine Cohodas is the author of “Spinning Blues into Gold: the Chess Brothers and the Legendary Chess Records” (St. Martin’s Press). It’s the story of brothers Leonard and Phil Chess, Jewish immigrants from Poland, who knew little about music, but somehow created the influential blues label, Chess Records. Muddy Waters helped them see the potential in the music and they went on to record Waters, Howlin’ Wolf, Willie Dixon, Chuck Berry, and others. Chess Records was located in Chicago.