Immortalized by Blondie, feted by the hip hop cognoscenti, Grandmaster Flash is the man who turned the humble record deck into an instrument as potent as the piano or guitar. He was the first DJ to put out a rap record and in “Adventures On The Wheels Of Steel,” he created an aural template that let the world at large into the secrets of the New York ghettos. If Afrika Bambaataa provided the ingredients and Kool Herc a rough method, more than any other, it was Grandmaster Flash who refined the recipe...