The acclaimed cellist Steven Isserlis is not only expert on his instrument but he knows all about Harpo Marx. There's a half-hour audio documentary over the BBC Radio website that you can listen to now and for the next seventeen days. I think it's a credit to the incredible, vivid imagery of Harpo that you can listen to audio clips from Marx Brothers films, as you will if you go over there, and still laugh at Harpo even when you can't see him. Go try it and see if you don't agree. And thanks to my buddy Greg Ehrbar for letting me know about this.