In the back left first floor room of the Robert Lange Studios Art Gallery

The studio is designed to be somewhat interactive (they also have an indoor swing) and there's a sign on the piano (a Steinway baby grand, iirc) that says something like "play if you know what you're doing, if you don't then don't". When I was there they had other music playing, but the person working there noticed when I started playing and turned it off.