This app provides a single key of a piano allowing you to play one of 88 sounds. You can put more Surfaces or other touchscreen devices running Windows 8 next to each other to build up a huge Surface Piano. An unofficial world record has been achieved in Germany with 88 surfaces. You can find a video recording of the world record here: http://msft.it/SurfacePiano Have fun with your friends and play songs along with them! You can pick one of 88 sounds for your device.