Question:  Samvel Alumyan was a Soviet-Armenian classical pianist and frequent collaborator with a violinist many considered to be among the greatest violinists of what?
Sentence (from "Leonid Kogan"): Leonid Borisovich Kogan (Russian: Леони́д Бори́сович Ко́ган ; Ukrainian: Леонід Борисович Коган ; November 14, 1924 – December 17, 1982) was a preeminent Soviet violinist during the 20th century.
Relevant evidence: Yes