According to Brent Staples’ essay from a few decades ago, about how to not be seen as threatening as a black man in the US: “And on late-evening constitutionals I employ what has proved to be an excellent tension-reducing measure: I whistle melodies from Beethoven and Vivaldi and the more popular classical composers. Even steely New Yorkers hunching toward nighttime destinations seem to relax, and occasionally they even join in the tune. Virtually everybody seems to sense that a mugger wouldn’t be warbling bright, sunny selections from Vivaldi’s Four Seasons. It is my equivalent of the cowbell that hikers wear when they know they are in bear country.”