it's
not real... anyone who knows about a music keyboard will be able to tell you at least a dozen or more places during that video where the balls dont land in the right place up or down the keyboard to be playing the sequences of notes that he's playing.
he might be playing notes rising in pitch.. andyoull actually see the balls landing sometimes up sometimes down.
this cannot be real... he'd be playing gibberish
not to mention the fact that the size of the balls wouldnt allow for him to hit single keys accuratley enough anyway... the keys are too thin... he'd be hitting 3 keys at a time with balls that big *ahem*
doesnt mean it's not GREAT to watch.
guys, musicians... back me up here?
oh.. and its easy to fake for when people go and have a look, someone off stage just flips a switch and turns it from a sequential/single hit sequencer... to a real keyboard... easy to do

and the audience members think it's real