This latest entry in Backbeat's bestselling handbook series starts by exploring the humble beginnings of blues guitar through the early decades of the 20th century, including profiles of such players as Robert Johnson, Charley Patton, and Son House. As the story moves into the '40s and '50s, and blues players migrate to major urban centers, author Adam St. James follows the evolution of the music at the hands of such electric blues kingpins as Muddy Waters, Howlin' Wolf, and B. B. King. Then it's the blues-rockers of the '60s, '70s, and '80s …