Microsoft opened up the Xbox Music API to devs. They will even let devs get a cut of the profit. Good news all around. Hopefully some innovative devs really do something great with this.
Microsoft Extends Xbox Music API Availability for Third-Party Developers - Xbox Music for Developers - Site Home - MSDN Blogs
Microsoft Extends Xbox Music API Availability for Third-Party Developers - Xbox Music for Developers - Site Home - MSDN Blogs