This is Sonny Boy Williamson II, whose 1940s Mississippi Delta radio broadcasts for King Biscuit Time made him one of the most influential of all blues musicians. A master harmonica player, he created relaxed songs, often humorous, that reminded urban listeners of their country roots. These tracks are from his years at Chess, beginning in the mid-1950s until his death in 1965. His recording bands feature Muddy Waters, Otis Spann, and Robert Lockwood Jr., among others. Perhaps his best-known track here is "Don't Start Me to Talkin' (I'll Tell You Everything I Know)," but his signature sound is evident on every high trill he played. --Robert Gordon