http://www.cliki.net/CL-IO-MOD
Might do the job for one format. You'd have to import some other library to play the decoded sound (there were multiple such libraries, like
http://lispgames.org/index.php/Cl-openal ).
If I was you, I'd use one of the available players written in C and just import them as they're fast and reliable (this is what I'd do for any language, be it C or something high-level).