At a pre-concert lecture, the conductor of a symphony orchestra was telling the audience about the major work that the orchestra would be performing at that evening's concert. The conductor told the people that if they listened carefully to the music, they would discover that it was both surprising and inevitable. On the one hand, the musical score would take a fair number of rather jarring and unexpected twists. There would be points in the concert when the blare of the trumpet or the sudden rolling of the timpani would seem to come from out of nowhere in a surprising fashion. On the other hand, h…