Who’s on the Left?

You know the pairs, but do you know which is which? That's the challenge of today's Lunchtime Quiz at mental_floss. You'll be given eleven famous duos, and all you have to do is determine which one is one the left. Simple? No! Some of these pairs made me realize that I never bothered to learn one from the other. I scored 64%, which is about the average. No doubt you will do better! Link