iTunes shared music behind a router

[k900]

Hey guys, I'm in a college dorm and all of my buddies share there music on itunes. However, I'm using a router so I can have my xbox hooked up at the same time. I've tried forwarding ports 22 and 3689 to my pc, but that isn't working. Any ideas on how to set this up? Its a buffalo airstation router and itunes 5.0 if that matters..

thanks,
Kevin