Still Alive is the closing song of Portal, the puzzle game released by Valve in 2007, performed in character by GLaDOS, the artificial intelligence who oversees the Aperture Science test chambers. Written by Jonathan Coulton and sung by Ellen McLain, the song became one of the most recognisable pieces of game music of its era and circulated widely through videos, covers and soundboards. The short Aperture Science line works on its own because it instantly signals the game's world, making it a lasting shorthand for Portal, artificial intelligence and darkly comic science.