The Beatles. The name alone conjures up images of mop tops, yellow submarines, meter maids and walruses. The Fab Four are arguably the most renowned and influential rock band to ever strap on guitars. Their stamp is present in virtually every corner of rock and roll, from their initial appearance on "The Ed Sullivan Show" to their classic final performance on a London rooftop. The Beatles are true icons, and even though we've lost two, their music lives on through their recorded catalog. So you think you're a fan? Find out by taking The Ultimate Beatles Quiz.