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, a musical technician named ...

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, ...