A profound, powerful and yet unfinished opera, Moses und Aron ends with an admission of defeat: "O word, thou Word that I lack!", Moses' last cry, is also the last phrase the composer has been able to set to music. Recounting the story of Moses, who has experienced the immensity of God, and of Aron, who tries to speak of it; casting doubt, with dodecaphonism, upon the adequacy of tonal and traditional musical language; Moses und Aron questions the possibility of a True Speech. Following in their wanderings the chidlren of Israel, a stateless people lost in the desert and looking for signs and images, Moses un Aron symbolizes the challenges encountered by a community looking for her own identity, torn between spiritual ideal and material needs. The opera thus reveals, in Romeo Castellucci's spectacular and poetic staging, a tragic divide between what can and cannot be represented, between God and idols, between endlessness and constriction, between the realm of intuition and the realm of language. The Paris Opera Chorus and Orchestra, who, thanks to his musical director Philippe Jordan's work, has pierced all the secrets of Schönberg's audacious score, reveal with grace and accuracy all the emotion contained in this anxious, overwhelming and unforgettable masterpiece.