Check out the video below – it’s from the Copenhagen Metro and features a flash mob. Watch how the passengers smile when the music begins to play. One of the things I’ve noticed as I travel on public transportation systems around the U.S. and Europe is that most people always seem so unhappy. What if light classical music was playing in the background? Would that help people to enjoy their trip a bit more and maybe instead of thinking about whatever is making them unhappy, they would focus on the music?