Learning a Lisp

So I'd like to learn a Lisp. What dialect should I use? I believe Common Lisp is the most widely used one. And what about books, online tutorials?

Scheme is the best Lisp to learn first as its very simple. The best book to learn Scheme is "Simply Scheme" which is for people who dont have the college math background that is needed for SICP. Simply Scheme uses some syntax add-ons from the Logo language (another Lisp dialect).