71. Lightnin' Hopkins
Sam "Lightnin'" Hopkins learned the blues from Blind Lemon Jefferson in the Twenties. He was a ferocious electric stylist in the Fifties, though he's perhaps best known for his nimble acoustic fingerpicking during the Sixties folk-blues revival. As unpredictable as John Lee Hooker, he seemed to be making it up as he went along, and often was.