Jonathan Coulton, or "JoCo" to his fans, is one of the most successful unsigned artists ever. With his large Internet presence and geek-friendly songs such as Code Monkey, Re: Your Brains, Ikea, and Skullcrusher Mountain, Coulton enjoys a certain type of popularity. He has also collaborated with John Hodgman on the audio versions of his books and wrote the end-credits songs for the video game "Portal" and its sequel, "Portal 2".