How do I stream radio to my system?

I currently stream my cd library (saved to an Apple Time Capsule using iTunes) to a Zardoz (a modified Airport Express) which is wired to my preamp. I love the sound and convenience. But now I've got Sirius/XM radio in my car, liking it alot, and thinking it would sound really nice coming thru my big rig. Can I access radio over the internet and stream it using the same hardware/software?