Rarely staged in concert halls given its unconventional configuration of the space, Pierre Boulez’s spatial masterwork is written for and realized at the Armory by Ensemble intercontemporain and conductor Matthias Pintscher, who perform this emblematic work twice in succession each evening, with the audience changing seats in between to gain a new sonic perspective. This remarkable presentation marks the first performance in New York of a major work by Boulez since his death in early 2016.