I was privileged to see Louis Armstrong in concert in 1961, when I was seventeen years old. He kept a stack of white cloths in the grand piano on stage, and periodically pulled one out and wiped his face with it. The woman who sang with him was magnificently, radiantly black, as wide as she was tall, and her gown glittered when she moved. She danced, she sang that night as though the lightning of all that was sacred inhabited her. Mr. Armstrong’s playing was closer to revelation than anything I’d experienced in my young life until that one incredible evening. It wasn’t an experience one ever forgets, and I haven’t. People who like to think that the world can be reduced to their bloodless, misanthropic calculations really have no idea….