He went to Mozart. He pored over the Jupiter, as a scholar might. But even the cosmic finale was lost in familiarity, or something worse. The notes were all still there, audible enough. But they’d flattened out, somehow, lost their vigor. And the phrases they formed sounded metallic and dun. It took him some weeks to realize: His hearing had changed. He was just sixty-five, but something had broken in the way he heard.