Question: Which leading Soviet Armenian composer composed the ballet whose libretto was written by Konstantin Derzhavin?
Sentence (from "Ivan Isakov"): Ivan Stepanovich Isakov (Armenian: Հովհաննես Իսակով , Russian: Иван Степанович Исаков ; (22 August [O.S. 10 August] 1894 – 11 October 1967), born Hovhannes Ter-Isahakyan, was a Soviet Armenian military commander, Chief of Staff of the Soviet Navy, Deputy USSR Navy Minister, and held the rank of Admiral of the Fleet of the Soviet Union.
Relevant evidence: No