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Ludwig van Beethoven (1770–1827), composer
Originally Moscow Conservatory Quartet, from 1931 Beethoven Quartet
Information about the later years is not what is contained in several official Soviet and Russian sources; verification needed.
Quartet page at Belcanto.ru [2012-06-07]
100 Years of the Saint Petersburg Philharmonic [2023-03-10]
Погадаева, Наталья Олеговна: Автореферат, Фёдор Серафимович Дружинин—Исполнитель, Педагог, Композитор (Pogadaeva, Natal'ya Olegovna: Abstract, Fëdor Serafimovich Druzhinin—Performer, Teacher, Composer). PhD dissertation, Leopold and Mstislav Rostropovich State Institute of the Arts, Orenburg, 2009.