Question: Which major Russian composer of the 20th century wrote a piece that was premiered by the Beethoven Quartet in 1964?
Sentence (from "String Quartet No. 9 (Shostakovich)"): Dmitri Shostakovich's String Quartet No. 9 in E-flat major, op. 117, was composed in 1964 and premiered by the Beethoven Quartet.
Relevant evidence: Yes