If you've ever watched the IFC show Comedy Bang! Bang!, you're probably familiar with a segment called "Reggie Makes Music." It features one of the hosts, Reggie Watts, creating an improvised song with a guest. This time, Joseph Gordon-Levitt joins in and kills it. It starts off a little slow, but stick with it until he starts singing, around 2 minutes and 40 seconds in. He's so good at it! Watch below, and check out more viral videos.