All I know about Xenakis is that he was a Greek mathematician and architect. He used mathematical principles in his compositions and his building plans. I would like to know how he did that and what kind of music forms when using math to write it. I don't see how it could produce any kind of melody, harmony, or stay inside the boundaries of tonality or serialism. Could someone be kind enough to post a clip of one of his peices, of which Metastasis is one of the most famous, I think. Could someone also provide me more information on him, as I don't usually listen to the avant-garde that much. Thankyou.