Question: Which leading Soviet Armenian composer composed the ballet whose libretto was written by Konstantin Derzhavin?
Context: Garo Hovannesi Zakarian (Arm: Կարո Հովհաննեսի Զաքարյան; 15 December 1895, Van, Ottoman Empire - 11 May 1967, Yerevan, Armenian SSR), was a Soviet Armenian composer and conductor.  He was named a People's Artist of Armenia in 1960. Artemi (Harutyun) Ayvazyan (Armenian: Արտեմի Այվազյան , Russian: Артемий Айвазян ; June 26, 1902 in Baku – November 14, 1975 in Yerevan) was a Soviet Armenian composer, conductor, founder of the Armenian State Jazz Orchestra, and People's Artist of Armenia (1962). Konstantin Derzhavin (, Batumi – 2 November 1956, Leningrad) was a Russian literary and theater critic, translator, and writer.  He wrote the libretto to Aram Khachaturian's ballet "Gayane".  His wife was the ballerina Nina Aleksandrovna Anisimova. Constantine Garrievich Orbelian, Jr. (Armenian: Կոնստանտին Օրբելյան , Russian: Константин Гарриевич Орбелян , born San Francisco, 27 August 1956) is an American conductor and pianist of Armenian and Russian descent.  He is named after his paternal uncle Konstantin Orbelyan, a major Armenian composer. The Armenian Soviet Encyclopedia (Armenian: Հայկական սովետական հանրագիտարան , "Haykakan sovetakan hanragitaran"; ASE) publishing house was established in 1967 as a department of the Institute of History of the Armenian Academy of Sciences under the presidency of Viktor Hambardzumyan (1908–1996), co-edited by Abel Simonyan (1922–1994) and Makich Arzumanyan (1919–1988).  In 1988–1999 the editor-in-chief was Konstantin Khudaverdyan (1929–1999) and since 1999 Hovhannes Aivazyan.  It produced the "Soviet Armenian Encyclopedia" (also rendered "Armenian Soviet Encyclopedia"; "Armenian: Հայկական Սովետական Հանրագիտարան ", "Haykakan sovetakan hanragitaran ", "Russian: Армя́нская сове́тская энциклопе́дия ", "Armyanskaya sovetskaya entsiklopediya " АСЭ ) from 1974–1986. Gayane ("Gayaneh" or "Gayne" (the "e" is pronounced); Armenian: Գայանե ; is a four-act ballet with music by Aram Khachaturian.  Originally composed in or before 1939, when it was first produced (in Yerevan) as "Happiness".  Revised in 1941–42 to a libretto by Konstantin Derzhavin and with choreography by Nina Aleksandrovna Anisimova (Derzhavin's wife), the score was revised in 1952 and in 1957, with a new plot.  The stage design was by Nathan Altman (scenery) and Tatyana Bruni (costumes). Due to historical and political reasons, only a small portion of Armenian athletes and athletes of Armenian descent have competed for Armenia.  Armenian kings Tiridates III and Varazdat were recorded as champions in the Ancient Olympic Games.  The first Armenians to participate in modern Olympics were Mkrtich Mkryan and Vahram Papazyan from the Ottoman Empire.  Both competed in athletics at the 1912 Stockholm Games.  The first Armenian to win a medal was Hal Haig Prieste, a son of Armenian immigrants, who won a bronze medal in diving at the 1920 Antwerp Games for the United States.  Soviet Armenian gymnast Hrant Shahinyan became the first Armenian gold medalist of the modern Olympics in 1952. 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.  He played a crucial role in shaping the Soviet Navy, particularly the Baltic and Black Sea flotillas during the Second World War.  Aside from his military career, Isakov became a member and writer of the oceanographic committee of the Soviet Union Academy of Sciences in 1958 and in 1967, became an honorary member of the Armenian Soviet Socialist Republic's Academy of Sciences. Aram Il'yich Khachaturian ( ; Russian: Ара́м Ильи́ч Хачатуря́н ; Armenian: Արամ Խաչատրյան , "Aram Xačatryan"; ] ; 6 June [O.S. 24 May] 1903 1 May 1978) was a Soviet Armenian composer and conductor.  He is considered one of the leading Soviet composers. Gevorg Avagyan (Armenian: Գևորգ Սիմոնի Ավագյան , Russian: Геворк Семенович Авакян ; 1922–2013) was a Soviet Armenian painter, one of representatives of post-war Soviet Armenian artists generation.
Answer: Aram Khachaturian