“In Washington DC, at a Metro Station, on a cold January morning in 2007, a man with a violin played six Bach pieces for about 45 minutes. During that time, approximately 2000 people went through the station, most of them on their way to work.
After about four minutes, a middle-aged man noticed that there was a musician playing. He slowed his pace and stopped for a few seconds, and then he hurried on to meet his schedule.
About four minutes later, the violinist received his first dollar. A woman threw money in the hat and, without stopping, continued to walk.