Claim: In the premiere of The Merchant Kalashnikov, Tsar Ivan IV was played by Fyodor Stravinsky, a bass, and Alyona Dmitriyevna, Kalashnikov's wife, was played by Wilhelmina Raab, a soprano.
Evidence: Tsar Ivan IV Fyodor Stravinsky bass Alyona Dmitriyevna, Kalashnikov's wife Wilhelmina Raab [] soprano