Microsoft’s biggest announcement this week wasn’t its Surface 2 or Surface Pro 2 tablets, or even what was inside them. It was a surprising Music Cover and the thinner, more impressive second-generation Touch Cover. Instead of rethinking the core concepts behind the Surface itself, Microsoft is getting adventurous with the accessories. For the Music Cover, the company worked with Joe Hahn of Linkin Park to launch a product designed specifically to allow aspiring DJs to remix music through a Surface 2 or Surface Pro 2 tablet. While the cover lights up and offers a number of touch points to control the volume of tracks and individual beats, it feels like it’s just the beginning of the possibilities for the future of Touch Cover.