“What’s that you’re listening to?” asked my wife the other day. “It sounds like Darmstadt music.”  Darmstadt is the German city that was famous for its International Summer Schools for new music in the 1960s, a regular fixture in the creative calendar for names such as Stockhausen, Xenakis and Nono. To go to Darmstadt you had to be a total dodecaphonist, and (according to Hans Werner Henze) submit your manuscripts to Pierre Boulez for prior approval. That was one reason why the school, to which my wife’s family in Munich had some loose connections, eventually folded. I was listening to…