Scheme In Common Lisp?

Hello /prog/

I recently got myself SBCL to play with. Now i also want to play with scheme maybe, but instead of downloading a separate program i was wondering if there is a scheme implementation in common lisp and if there is more than one which should i use.

>>7
Thats cool, thanks.

Tough i would prefer r5rs, as i understand its what /prog/ would consider the best scheme, yes?