He threw himself into the crushing routine. A few semesters of teaching the rudiments of music made him realize how little of the mystery of organized vibrations he’d ever understood. The whole enigma unfolded in front of him, and he stood back from it as baffled as a beginner. He tried to tell his freshmen the simplest things—why a deceptive cadence makes a listener ache or how a triplet rhythm creates suspense or what makes a modulation to a relative minor broaden the world—and found he didn’t know.