Conductor Marin Alsop discusses the history behind Leonard Bernstein's "Kaddish." "Leonard Bernstein’s Kaddish Symphony" premieres Monday, August 21 at 9/8c on PBS. [VID: Kaddish Symphony -- his last symphony, the third symphony -- is a very complex piece. Because it's not only about the world he was inhabiting. It's also about the world of his family. You know, of course, his father was deeply religious, and he comes from a very, very, very serious, I would say, even heavy Jewish tradition and