Guitarist and vocalist Reverend Gary Davis and harmonica virtuoso Sonny Terry were two of the great artists of the rural blues tradition; both of them made outstanding records in the 1930s and '40s, while Davis was rediscovered in the 1960s by a new generation of blues and folk fans (many years after he forsake the blues to become an ordained minister), and Terry had carved out a unique show-biz career as a musician and actor who was as popular on Broadway as he was in blues clubs. Masters of the Country B...