Sign on to your XBOX Live Gold account
Select MusicMarketplace/Zune from the dashboard
Select Zune pass tile and follow the on-screen instructions.
What's more, your Zune Pass isn't limited to your Xbox 360—it's yours to use anywhere you have Zune. That means you can listen to streaming music using:
Zune on Xbox LIVE on Xbox 360
The Zune software on a PC
A Zune HD player
A Windows Phone 7
Zune.net, which means you can stream music anywhere you have a web browser with Internet access
Get the Zune software for your Pc by Clicking Here
