Jay Greenberg is a 15-year-old composer who’s being touted for great things. The hype is building. “But although no one can prophesize what kind of composer Greenberg will turn out to be, he will not be the next Mozart. No one can be that, no one should be that. If we come away with nothing else from the 250th anniversary of Mozart’s birth, which is being celebrated this year, it should be that times have changed and that it isn’t nice to exploit kids.”