During my lifetime, I have seen well-to-do people of color gleefully collecting vintage bric-a-brac that in the days of their parents and grandparents would have fueled race riots. I can bravely predict that in another generation or two, when I am no longer around to see it, The Mikado will be rediscovered and gleefully performed as its authors envisioned it, with everyone-including Japanese-wondering what all the fuss was about. Meanwhile, those...