(This requires a large screen, trust me - I've taught it)

Dance Dance Revolution style piano teacher. 52 slots (thin columns), left to right, for each white note on the keyboard. The black notes lie in between and are colored darker. Right hand notes green, left hand notes red. Notes scroll up the screen and hit a graphic piano keyboard at the time you play each note. It plays just like Dance Dance Revolution, with one sensible addition: solid horizontal lines indicate bars, dotteds indicate beats, thus eliminates the need for both key signatures and rhythmic notation, since nobody really needs either at the early stages of piano. And many don't ever learn or care even at more advanced stages.I'd pay 200 bucks for it.

My experiment:MIDI program with "piano roll" view rotated in second display. I set the track colors as mentioned above and let the keyboard send MIDI controls to determine tempo rations and track soloing (same as hand soloing, since track 1 = RH, track 2 = left hand). Super efficient.

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