An arrangement of blue sounds, for those who know. Featuring Yusef Lateef, Charles Mingus, Lightnin' Hopkins, Sonny Boy Williams II, Ray Charles, Eric Bibb, B.B. King, Gil Scott-Heron, Muddy Waters, Buddy Guy, Big Mama Thornton, Elmore James, Willie Dixon, Earl Hooker, J.B. Lenoir and Junior Wells.