Question: The class is named after the first ship in the class "Dmitriy Shostakovich", which in her turn was named after Dmitri Dmitriyevich Shostakovich, a Russian composer and pianist, regarded as one of the major composers of which century?

Context paragraphs:
Shostakovich (1969-1981): "Shostakovich" (1969-1981) is a series of thirty oil paintings by Aubrey Williams.  Each painting in the series is based on a particular symphony or quartet by the Russian composer Dmitri Shostakovich, whom Williams regarded as "the greatest composer of [his] time".

Dmitri Dmitriyevich Pavlov: Dmitri Dmitriyevich Pavlov (Russian: Дмитрий Дмитриевич Павлов ; born 5 January 1994) is a Russian football forward.

Dmitriy Shostakovich-class ferry: The "Dmitriy Shostakovich" class is a class of seven ro-pax ferries of project B-492/B-493 originally built by Stocznia Szczecinska im Adolfa Warskiego Warskiego in Szczecin, Poland and used by the Soviet shipping companies, Black Sea Shipping Company, Estonian Shipping Company, Baltic Shipping Company and Far Eastern Shipping Company, as ferries and passenger/cruise ships.  The class is named after the first ship in the class "Dmitriy Shostakovich", which in her turn was named after Dmitri Shostakovich.

Sofia Moshevich: Sofia Moshevich (Hebrew: סופיה מושביץ'‎ ‎ ; born 1949) is a Ukrainian-born pianist, teacher and researcher who lived in Moscow, Jerusalem and Johannesburg before emigrating to Canada where she now lives in Toronto.  Since the early 1970s, she has taken a special interest in the Russian composer Dmitri Shostakovich, making a careful analysis of his recorded performances as a pianist.  Two books document the results of her work: "Dmitri Shostakovich, Pianist" and "Shostakovich's Music for Piano Solo, Interpretation and Performance".  She also contributed a chapter on piano music to "A Shostakovich Companion", edited by Michael Mishra.

Jovdat Hajiyev: Ahmad Jovdat Ismayil oglu Hajiyev (June 18, 1917 - January 18, 2002) was one of the major Azerbaijani composers of the Soviet period.  He is remembered for his monumental orchestral works, having been the first Azerbaijani to compose a symphony (1936).  He studied under Azerbaijan's Founder of Composed Music, Uzeyir Hajibeyov and under Russian composer Dmitri Shostakovich.

Shostakovich v. Twentieth Century-Fox Film Corp.: Shostakovich v. Twentieth Century-Fox Film Corp., 80 N.Y.S.2d 575 (N.Y. Sup.  Ct. 1948), aff'd, 87 N.Y.S.2d 430 (N.Y. App.  Div.  1949), was a copyright lawsuit.  In "The Iron Curtain", a 1948 motion picture depicting Soviet espionage in Canada, Twentieth Century Fox used compositions by composers, who were citizens and residents of the Soviet Union as background music, and on the film credited these composers with the compositions.  The name of one of the composers, Dmitri Shostakovich was also used in the picture when one of the characters therein incidentally referred to him in an appreciative manner.  All of the music used was in the public domain and had no copyright protection, therefore the court refused to the use of the names and the music.

Shostakovich Peninsula: Shostakovich Peninsula is an ice-covered peninsula lying north of Stravinsky Inlet and extending into Bach Ice Shelf in southern Alexander Island, Antarctica.  The peninsula was first mapped by Directorate of Overseas Surveys from satellite imagery of Antarctica supplied by U.S. National Aeronautics and Space Administration in cooperation with U.S. Geological Survey.  Named by United Kingdom Antarctic Place-Names Committee after Dmitri Shostakovich, Russian composer (1906-1975).  Shostakovich Peninsula is one of the eight peninsulas of Alexander Island.

Dmitri Shostakovich: Dmitri Dmitriyevich Shostakovich (Russian: Dmitriy Dmitrievich Shostakovich , ] ; 25 September [O.S. 12 September] 1906 9 August 1975) was a Russian composer and pianist.  He is regarded as one of the major composers of the 20th century.

Ian MacDonald: Ian MacCormick (known by the pseudonym Ian MacDonald; 3 October 1948 – 20 August 2003) was a British music critic and author, best known for both "", his critical history of the Beatles which borrowed techniques from art historians, and "The New Shostakovich", a study of Russian composer Dmitri Shostakovich.  MacDonald was instrumental in popularising Nick Drake during the late 1970s and early 1980s.

Testimony (book): Testimony (Russian: "Свидетельство") is a book that was published in October 1979 by the Russian musicologist Solomon Volkov.  He claimed that it was the memoirs of the composer Dmitri Shostakovich.  From its publication, its portrayal of the composer and his views was controversial: the Shostakovich of the book was sometimes critical of fellow composers, and most notably was strongly anti-Soviet in his views.  The book also contained comments on his own music, indicating that it was intended as veiled criticism of the Soviet authorities and support for the dissident movement.  The authenticity of the book is still very much disputed.

Supporting paragraphs: Dmitriy Shostakovich-class ferry Dmitri Shostakovich
Answer: 20th