Would a self-playing piano be possible? I guess what I'm asking is, can you rig a piano so that when light hits the keys, they are triggered to play? (Think: those easy-learning pianos where the keys light up for you, only self-playing). Is there any sort of sensor that could trigger a down-ward pressure on the keys when light reaches them? Sorry for my lack of tech know-how. I'm just trying to get a sense of what might be possible for future reference. If this is not doable, what might be a feasible, lower-key arduino project involving piano? I'm not expecting specifics, just broad strokes and a general direction. I am a noob and realize that this would not be something I can tackle at this moment in time. I'm just very interested in the musical uses for Arduino.