Iannis Xenakis’s intense creative experimentation is at its most astounding in his work Pour la Paix. Created in response to a commission from Radio France, the composition was one of the few occasions when he used a mixed electroacoustic approach. Inspired by two books by Françoise Xenakis (the composer’s wife) and conceived for four narrators, choir and computerised composition tools (UPIC), it can be presented in four different versions. The most complete version will be performed at Gulbenkian Música, alongside four other pieces by Xenakis, according to an idea outlined by the percussionist Tomás Moital.