Question on hooking Xbox 360 up to my surround sound?

Can I hook up my Xbox 360 and Xbox 360 hd movie drive up though my Sony DVD player and surround sound. The surround sound unit is also a 5 disc dvd changer. I want to be able to play my xbox 360 through its speakers and also be able to watch the movies I play on my xbox 360 through it's speakers so I have surround sound for everything. If this is possible, how does it need to be hooked up?