Alan Kozinn puzzles over pop stars’ desires to crossover to classical music. “It seems to be a part of the human condition that having established a specialty, we hanker to do something else. And far be it from me to say that we shouldn’t. But speaking as a classical music critic who also listens to lots of rock – and who wishes that more rock fans found classical music exciting as well – I must confess that I find many of these crossover incursions dispiriting. For one thing, rock stars who become interested in classical music are bizarrely conservative.”