Functional languages

I want to learn functional programming. What language should I use?

Common Lisp
bigger community and usage, people like Alan Kay or Dijisktra said it opens your mind to higher levels, macros, Stallman recommends it

Haskell
Strong typing, pure functional, less weird syntax

>>5
Scheme is basically Lisp
Well, that's because Scheme is a Lisp. If you meant CL, no, they're like C and Java: similar syntax, completely different languages.

Scheme is cleaner, Common Lisp is ENTERPRISE-QUALITY.

But if you want pure functional programming, choose Haskell, if you don't care about purity, use an ML (are they still a valid choice, right?).
If you want a Lisp, pick whatever. Scheme encourages functional style.