ProfessorChaos Believable up until the finish, where the rate of the piano is faster then his hands... Good juggling, at least.
fluffy I totally believe that's just crappy video encoding to blame there.
fatatty I actually looked around and found someone who noticed a giveaway at 1:34 in the video. Right after that he plays one note twice, but the balls land in two different spots on the keyboard.
That probably means the keyboard just plays the right note when a ball hits it. So he is juggling off the piano in the correct rhythm, meaning the piano wouldn't have played faster than his hands, but he doesn't actually have to hit all the right keys.