Some people couldn't think of a happy song off the top of their head ... these are the happy songs hand-picked by 100 people between the ages of 6 and 80. As I assembled this eclectic list ...

Billboard has ranked the top 100 songs of the 21st century. And while the list is full of your favs that have been killing it since year 2000, right now we're giving you a taste of the top 3.