 Members of Camerata of Cologne in that F major sonata by Wilhelm Friedemann Bach. Here's another sonata, but it's by Wilhelm Friedemann's little brother, Carl Philipp Emanuel Bach. And this is a B minor sonata for the keyboard. It's played here, though, on a clavichord. You have a piano, which has a felt hammer, which hits the strings. You have a harpsichord, which plucks the strings. A clavichord's different in that it has a small...