EXCERPT The images in the following pages are screenshots taken during the drafting of the electronic ‘score’ of Haswell & Hecker’s collaborative sound work, Blackest Ever Black, composed using Iannis Xenakis’s UPIC. The conception and continued development of the UPIC—a digital system allowing the creation of music through the simple act of drawing—may seem, if not a departure, then something of a minor element of Xenakis’s oeuvre (only a handful of Xenakis’s works were composed exclusively using the UPIC). But an examination of the thinking behind this technology sheds much light on the philosophical importance and integrity of Xenakis’s work, and its points of intersection with the philosophy of Deleuze (and Deleuze/Guattari)…