Jonathan Coulton (born December 1, 1970), often called "JoCo" by fans, is an American singer-songwriter, known for his songs about geek culture and his use of the Internet to draw fans. Among his most popular songs are "Code Monkey", "Skullcrusher Mountain", "Re: Your Brains", "Still Alive" and "Want You Gone" (the last three being featured in games developed by Valve: Left 4 Dead 2, Portal, and Portal 2 respectively).
His album Artificial Heart was the first to chart, eventually reaching #1 on Billboard's Top Heatseekers and #125 in the Billboard 200.
Coulton's music tends to fit a folk rock style, with elements of pop and indie rock.
Coulton graduated in 1993 from Yale, where he was a member of the Yale Whiffenpoofs. A former computer programmer employed at Cluen, a New York City software company, and self-described geek, Coulton tended to write quirky, witty lyrics about science fiction and technology: a man who thinks in simian terms, a mad scientist who falls in love with one of his captives, and the dangers of bacteria. Rare topical songs include 2005's "W's Duty", which sampled President George W. Bush, and 2006's "Tom Cruise Crazy". Most of Coulton's recordings feature his singing over guitar, bass, and drums; some also feature the various other instruments Coulton plays, including accordion, harmonica, mandolin, banjo, ukulele, zendrum and glockenspiel.