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Aaron Siegel’s suite of songs, delivered by the unearthly American countertenor Anthony Roth Costanzo, are short, elegant and uncluttered, bringing the vocal works of Ives and Messiaen, or even Purcell, to mind.

It would be rash to make assumptions about the composer/performer collective based on a single program, but it was still not to notice a divergence from the past in the program of world premieres.