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Giannis Klearchou Xenakis is the full name of the Greek composer, Iannis Xenakis. He was born in Athens, Greece in 1922 and died in Paris, France in 2001. He is considered one of the most important composers of the 20th century. His music is often described as experimental and avant-garde. It is characterized by its use of unusual sounds and rhythms, as well as its mathematical and geometric structures.