Poulenc’s Gloria, with its unexpected blend of secular and sacred sounds, fascinated (and scandalized) audiences from its first performances. “While writing it I had in mind those Crozzoli frescoes with angels sticking out their tongues,” the composer remarked. Lili Boulanger’s impressionistic “Of a Spring Morning” introduces the program with a bright festivity. Jean-Marie Zeitouni, a conductor of “ebullience and infectious enjoyment” (Boulder Weekly), leads this vivacious performance, which invites the Milwaukee Symphony Chorus and soprano Joélle Harvey to the stage for an evening of exultation that will keep music-lovers enraptured to its final whispered “Amen.”