What's cooler than playing the clarinet? Playing the imaginary clarinet, of course. In all seriousness, check out this very cool project from SparkFun customer Scott Peterman.
Scott has created what he called "The Imaginary Marching Band." Using an Arduino board, an MPX4115A pressure sensors, and a host of other parts, the Imaginary Band lets its user wear specially outfitted gloves that mimic a variety of instruments.
The result is really cool. Scott does an excellent job of documenting the project on his website. If this project inspires you to get up and march around, maybe consider donating a little to his KickStarter project (Scott's looking to start touring - really!). Maybe he'll come to a town near you. Nice work!