“Fold by fold”—pli selon pli—Pierre Boulez reveals a portrait of the poet Stéphane Mallarmé, arguably the most important literary influence on his music, in his eponymous work for soprano and orchestra. Michael Wendeberg, who worked closely with Boulez as pianist of the Ensemble intercontemporain, conducts excerpts from the composer’s most expansive score, in the piece’s Pierre Boulez Saal premiere. The program also includes the 1965 ensemble work Éclat as well as compositions by Maurice Ravel and Austrian composer Thomas Wally, born in 1981.