Eye- and face-tracking systems already help you communicate when your hands aren't an option, but what if you want to have some fun? You're covered there, too. Andreas Refsgaard has built Eye Conductor, an app designed to help the paralyzed (and virtually anyone else) make music. All you need is a computer, an off-the-shelf eye tracker and a willingness to look slightly goofy as you twitch your eyes and open your mouth. Unlike some previous attempts, it's all about having an accessible, flexible interface -- you know exactly what sounds you'll make, whether it's an experimental piece or a slick dance track.