Question: Mstislav Rostropovich, Daniil Shafran and Sviatoslav Knushevitsky were leading examples of what kind of musician among 20th century Russians?
Sentence (from "Sviatoslav Knushevitsky"): Sviatoslav Nikolayevich Knushevitsky (also seen as Knushevitzky; 6 January 1908 [O.S. 24 December 1907] 19 February 1963) was a Soviet-Russian classical cellist.
Relevant evidence: No