Arthur and Lucas Jussen are not twins, though they could pass for it if you failed to notice a slight difference in height. They have the same color of hair, blond, and very similar facial features. But the important thing is that the Dutch teen-agers are musical twins. They were as one in Mozart’s Concerto in E-flat, K. 365, for two pianos (which was probably written for Mozart himself and his sister, Nannerl, so a genetic tie is appropriate).

Beautifully backed by Van Zweden and the DSO, the Jussens played cleanly and stylishly and projected a consistent sense of joy. This was playing to cheer up a misanthrope.