“It’s hard to describe an opera without any hard answers to the most basic of questions: Where are we? When are we? Who are these people onstage? And what on earth are they doing? Claude Vivier, the Canadian composer who is as imaginative as he is exasperating, named his opera Kopernikus, after the famed astronomer; and before you settle too comfortably into the idea that this is a biographical story of Nicolaus and his contemporaries, note the work’s subtitle: Opéra-Rituel de Mort (Ritual Opera for the Dead)…”

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