I’m sitting 20 feet away from one of the best string quartets in the world, listening to them practice, and banter, and practice, when they mention hocket—”Does anyone know what a hocket is?” Yes, I think—I vaguely remember learning about that 20 years ago, when my face was as young and fresh as the other faces in the room. “It’s a Harry Potter term,” the violinist says, smiling.