HE TRAGEDY OF MACBETH is the great Shakespearean play of stage superstition and uncanniness. It has always been considered by actors to be an unlucky play. Many will refuse to wear costumes that have appeared in productions of it; most, once they are acclimated to the mores of the theater world, will not mention the play's title, or the names of any of its characters, onstage or in the wings or dressing rooms. They call it, instead, “The Scottish Play.”