Matthias Pintscher leads the first of three Boulez Ensemble programs this season, featuring works for solo instrument and ensemble that take opposite approaches to the idea of a concerto. While Olga Neuwirth’s …miramondo multiplo…, which had its premiere in 2006 conducted by Pierre Boulez, explores “cooperation, democratization, and close listening” between the individual and the group, Hans Werner Henze makes the clarinet the protagonist of an “imaginary theater” in his 1981 Le Miracle de la rose, which was inspired by Jean Genet’s eponymous novel.