"It is almost Friday night. Outside, the dark is getting darker," and here and there around the city ninety-two men and thirteen women are getting dressed to go to work. First they bathe and put on their underwear. Then they don special black-and-white apparel. Then when the one hundred and five people are completely ready, each takes a musical instrument and travels to midtown. There, at 8:30 tonight, they will work together: playing.