UPIC

Xenakis was a trained civil engineer who worked for Le Corbusier's architectural studio for 12 years. He designed the Philips Pavilion for Expo 58 entirely by himself — a sculptural structure of hyperbolic paraboloids. The same mathematical surfaces appeared in his music: the string glissandi in Metastaseis (1953-54) were drawn as straight lines on a time-versus-pitch grid, creating the same shapes as the Pavilion's concrete walls. Xenakis had been sketching music since the 1950s. The UPIC gave those sketches a voice.

The UPIC workflow had three stages. Stage 1: draw a single-cycle waveform on the tablet — a sine wave, a sawtooth, a complex squiggle — defining the timbre. Stage 2: draw an amplitude envelope showing how loudness changes over time. Stage 3: on the main composition page (X=time, Y=pitch), draw pitch trajectories and assign saved waveforms/envelopes. The system rendered the sound. Real-time performance was also possible: moving the stylus across the tablet in real time. The entire original software was famously under one megabyte in size.

Xenakis designed UPIC to be usable by anyone, including children with no musical training. He wrote: 'Anybody, even myself or you, or children, can draw lines or graphics with an electromagnetic ballpoint, and they are transformed by computer directly into sound.' At KSYME, the Athens UPIC center founded in 1979, courses for up to 5,000 students aged 10-15 were announced in December 1986.

UPIC was the direct ancestor of graphical music creation tools. IanniX, an open-source graphical sequencer inspired by UPIC, is sponsored by the French Ministry of Culture. UPISketch, developed with the Centre Iannis Xenakis, runs on desktop and iOS. HighC continues the 'draw your music' tradition in education. The conceptual lineage extends to Max/MSP, MetaSynth, and image-to-sound software. Over 100 composers have created works with UPIC/UPIX, from Xenakis and Jean-Claude Risset to Aphex Twin.