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The surprise, though, came with the intricate “Conductus” from his 1944 Suite, influenced by his studies with Schoenberg.

Harrison’s march through styles didn’t leave out the 12-tone system, and Cahill threw in the thorny 1943 “Conductus” from a suite Harrison wrote when studying with Schoenberg.

Vetus abit litera- conductus- dissonance in the 13th century.

The ensemble sang with buoyant pulse in the lively and harmonically striking “Conductus: Fulget Nicholaus.”

A few of the Christian works — particularly a conductus, “O totius Asie Gloria”; a French crusaders’ song, “Chevalier, mult estes guariz”; and “O ffondo do mar tan chão” from the “Cantigas de Santa Maria” — are couched in the familiar modes of European medieval music.