Mycenae Alpha

A video on the score of Xenakis's Mycenae Alpha (1978).

This isn't a drawing a posteriori, however; the drawing itself generates the sound through a sort of granular synthesis. One of the software programs at CEMAMu (Centre d'Etudes de Mathématiques et Automatique Musicales), the research center where Xenakis worked, allows precisely this.

It's the UPIC (Unité Polyagogique Informatique du CEMAMu), a 75x60 cm graphics tablet on which the composer can draw shapes that are transformed directly into sound by the connected computer (and in my opinion, it often seems more concerned with the drawing than the sound).

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