Question: What great artist that Natalia Troitskaya sang with, did a duet with Freddie Mercury that became one of the two official theme songs for the 1992 Olympics?
Sentence (from "Montserrat Caballé"): She has sung a wide variety of roles, but Caballé is best known as an exponent of the works of Verdi and of the bel canto repertoire, notably the works of Rossini, Bellini, and Donizetti.
Relevant evidence: No