One of the strongest aspects of each year's musical line-up at the New Orleans Jazz and Heritage Festival is the large number of genuine innovators of a style. The 1998 schedule is as strong as any, boasting many musicians -- including Allen Toussaint, Ronnie Dawson, the Preservation Hall Jazz Band, Dejan's Olympia Brass Band, Etta James, Boozoo Chavis, and Dr. John -- whose distinct style and sound forever changed popular music as their influence is continually filtered down through generati...