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 ...

As strange instruments go, this one might take the biscuit. 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 quickly away, ...