6. Fun, 'We Are Young'
"We Are Young" was released last September, but it took an appearance on Glee and a Chevrolet commercial during the Super Bowl to start connecting with people. This past March, it reached Number One on the Hot 100 and has been absolutely inescapable ever since. It's fallen to Number Eight this week and is now only on the radio four times an hour, as opposed to the roughly 15 times per hour a few weeks ago.
Listen to the top 10 while you read with this Spotify playlist: