Whether to subvert our fears or to generate laughter from tension, filmmakers have frequently juxtaposed humor with the supernatural – or at any rate death. Get into the Halloween spirit with music from four macabre comedies, including “Arsenic and Old Lace” (Max Steiner), “The Trouble with Harry” (Bernard Herrmann), “The Ghost and Mr. Chicken” (Vic Mizzy), and “Beetlejuice” (Danny Elfman). It’s a mishmash of horror and humor, this Saturday at 6 pm.