Question: Mstislav Rostropovich, Daniil Shafran and Sviatoslav Knushevitsky were leading examples of what kind of musician among 20th century Russians?
Sentence (from "Sviatoslav Knushevitsky"): He was particularly noted for his partnership with the violinist David Oistrakh and the pianist Lev Oborin in a renowned piano trio from 1940 until his death.
Relevant evidence: No