In honor of his May 6th birthday, we're saluting the great Orson Welles with a pair of radio performances set on Baker Street. First, he's the great detective himself in "The Immortal Sherlock Holmes" from The Mercury Theatre On the Air (originally aired on CBS on September 25, 1938). Then, he's Holmes' archnemesis Professor Moriarty - opposite John Gielgud and Ralph Richardson as Holmes and Watson - in a syndicated production of "The Final Problem."