I see these links pop up every now and then, plus seeing it on Canada's Just For Laughs and while it is kinda cool it's a total scam. Anyone who plays piano can tell you that they are not playing the notes of the keys that they land on. It is some sort of device which plays a sequence of notes when it is hit (ie. with a ball). That sequence of notes would play even if you just sat there mashing the same key every time... it would play the same song.
I'm not wrong . Just watch it, sometimes a lower note is played, yet he is higher up on the keyboard than the last note played... uh.. no.