It's not enough anymore to simply cram a single-octave keyboard into the bottom of a Nintendo DS, effective piano instruction requires at least twice as many keys -- and an iPad. The Ion Piano Apprentice (when coupled with a compatible iDevice and companion app) offers aspiring Tchaikovskys octave-selectable free play, lessons on reading sheet music, and even a view of award-winning piano instructor Scott Houston's handsome hands. If those mitts are too distracting for you, just follow along with the light-u
