I'm teaching a film history class, and have had good luck using documentaries and DVD extras about various film genres and film movements. But I've got the topic of German Expressionism (Lang, Murnau, etc.) coming up, and I don't know of any video material I could use. I'm looking for recommendations for any documentaries or DVD supplemental "making of" material about the history of German Expressionism, and the various important filmmakers who made it what it was. Thanks.