Rolling Stones guitarist Keith Richards has cheated death so many times he’s like a cat with nine lives, only in his case, it’s probably ninety-nine. A show in Sacramento in December 1965 proved almost fatal for Richards. While he was singing, Richards, 82, didn’t realize his mic was ungrounded. “The strings of his guitar touching the metal stand shorted out the amp and sent a strong surge of electricity” through his body, writes Bob Spitz in the upcoming book “The Rolling Stones: The Biography.” A photographer who was there remembers that Richards was “unconscious for a long time,” and when...