Michael Cooper: “Of course they need to fix the acoustics. … But what about the little things that can make all the difference when it comes to creating a concert hall that people will fall in love with? The things that might not rise to the top of the to-do list when planning a mega-project that is expected to begin in 2019 and cost on the order of a half-billion dollars? As a frequent concertgoer, I have a few modest proposals.”