Will plays piano by himself

Will did this completely on his own, out of the blue. On Saturday I was getting ready for us to go tailgate after mom went to work and I heard someone playing the piano. I figured it was Duke, since he walks on the piano keyboard fairly often (and one reason we now shut the cats in the basement at night). Nope, it was Will figuring out how to play the piano without anyone else's help or even a lap to sit on. Lucky I had the camera in my pocket at the time. Since figuring out he could do this, he does it all the time now. He actually got mad yesterday when the piano bench was scooted out a little bit so he couldn't quite reach the keys.