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. Wayne Siegel is a composer, professor of electronic music and director of DIEM (the Danish Institute for Electronic Music) in Aarhus. Siegel was born in Los Angeles and came to Denmark in 1974 to study composition with Per Norgard. Since then Siegel has lived in Denmark, where from the beginning of the 1980s he has pioneered the development of electronic music and computer-based composition.