It’s an automatic piano with just four keys, and, as soon as you press a key to play a note, the whole set of four move ...

Why not 44, or 200? Let’s go back to the days before the piano, when composers wrote for the harpsichord, which has just 60 keys, and each key is its own note, its own sound. Around 1700 ...

CG Matter modified his keyboard to a pattern of three white keys and a black key that automatically moves to the next notes ...