A computer is connected to a massive pipe organ and robot musicians take control for the next 60 minutes–without human intervention. California-born composer Wayne Siegel (b. 1953) is a pioneer of computer-based music. In his work Celebration, the four manuals of the Hallgrímskirkja pipe organ in Reykjavík are controlled by four virtual musicians, all of them eager to express themselves individually but also programmed to perform together. Icelandic hymns and live-data from a weather satellite are interpreted by the virtual musicians playing the pipe organ, embedding human culture and the climate of our planet in everything they say.