From an interview of Helmut Lachenmann on composition, musical languages, and the origins of Musique Concrète Instrumentale:
Each concert hall should be a room for adventure, for having something which changes us, not just to conform our aesthetic world, to open it... The music must be strong enough to really be what we could call provocation... We must find provocation which is authentic, which is not repeatable... It is a question of material, and it is a question of [being attentive to] the anatomy of the sound and of the movement... here to be active and to be moved. This is the only reason why art still might survive.
Listen to the complete interview here: https://slought.org/resources/musique_concrete_instrumentale