Steve Ballmer revealed a new service yesterday that should be, ahem, music to your ears when it starts spinning this fall. During Microsoft's Worldwide Partner Conference in Los Angeles, the Windows chief mentioned Xbox Music -- a MS-branded music streaming service, with over 11 million songs and Kinect compatibility. That last feature will let you shout your music selections across the room, and could result in some pretty gnarly sibling battles whenever music tastes don't match. Unlike the console's
