If you miss the days when being a kid gave you a license to bang away incessantly at every piano you could find, Multiplayer Piano might just be the social music experiment you’ve been waiting for. The dead simple website offers a communal piano that users can play away at with their mouse cursors or keyboards. If the particular room you’re in gets overly crowded — or if someone comes in a spams A sharp — you can switch between available rooms or make your own.