Ed Ward covers the first half of the history of rock & roll in this sweeping and definitive narrative--from the 1920s, when the music of rambling medicine shows mingled with the songs of vaudeville and minstrel acts to create the very early sounds of country and rhythm and blues, to the rise of the first independent record labels post-World War II, and concluding in December 1963, just as an immense change in the airwaves took hold and the Beatles...