“Music is a labyrinth without beginning and without end, full of new paths to be discovered, where the mystery remains eternal.” This concert is dedicated to the composer and sound thinker Pierre Boulez, who would have celebrated his 100th birthday in 2025. And it is dedicated to “Dérive”, a cultural technique that is emblematic of Pierre Boulez's fascinating way of thinking in sound. The technique, defined by the writer Guy Debord, describes a way of wandering around a place in order to discover it. In the two works Dérive I and Dérive II, Boulez explored the many possible derivations of a hexachord by Paul Sacher. The six notes of this chord haunted Boulez for many years.