 Samvel Alumyan was a Soviet-Armenian classical pianist and frequent collaborator with a violinist many considered to be among the greatest violinists of what?
Samvel Alumyan: Samvel Alumyan (Armenian: Սամվել Ալումյան ; 1941–1987) was a Soviet-Armenian classical pianist, winner of the George Enescu International Piano Competition in 1967 (a prize shared ex-aequo with Radu Lupu). Samvel Alumyan:  He was a frequent collaborator of violinist Leonid Kogan, with whom he toured and recorded. 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. Leonid Kogan:  Many consider him to be among the greatest violinists of the 20th century.
the 20th century