A typical piano has 88 keys spanning just over seven octaves. There are other, smaller keyboards or synthesizers that have fewer keys – most come in increments of 25, 32, 49, 61 or 72 keys.

By James Barron Good morning. It’s Thursday. Today we’ll look at what happened to the keys on a concert pianist’s piano when he moved to New York from Paris. We’ll also look at what Donald ...