Almost everyone is wearing headphones, what song is in their heads?

Ty Cullen is a twenty-something videographer in New York.  Like many of us who walk the streets of NYC, he noticed that a majority of people are plugged into digital music players. Ty wonders what they were listening to, so recently he grabbed his camera and asked, "What song are you listening to?"

Over 650,000 people have checked out his video, he may be on to something.