Stereo Hearts (feat. Adam Levine)

Maroon 5 frontman Adam Levine sings the hook on this one, telling his girl that his heartbeat is a stereo that plays for her. Gym Class Heroes frontman Travie McCoy fills the verses with more music metaphors, at one point asking if she would keep him on her shoulder and change out his batteries if he was a 50-pound boombox.

"Stereo Hearts" was the first single from Gym Class Heroes' fifth album, The Papercut Chronicles 2. It was released on June 14, 2011 and got some heat when Adam Levine talked it up on The Voice, which was in its first season (he was a judge on the show). The song rose to #4 in the US in October and went on to post massive streaming numbers, earning over 500 million views on YouTube and nearly that many on Spotify.

The song was produced by the pop hitmaker Benny Blanco, whose resumé includes #1s for Kesha ("TiK ToK") and Katy Perry ("California Gurls," "Teenage Dream").