Look at all the people who don't notice the violinist in the baseball cap.
No one knew this, but the violinist was Joshua Bell, one of the greatest musicians in the world. He played one of the most intricate pieces ever written, with a violin worth $3.5 million dollars. Two days before Joshua Bell sold out a theater in Boston where the seats averaged $100.
This is a true story. Joshua Bell playing incognito in the metro station was organized by the Washington Post as part of a social experiment about perception, taste and people's priorities.