Sergey Ivanovich Taneyev (Russian: Серге́й Ива́нович Тане́ев, pronounced [sʲɪrˈɡʲej ɪˈvanəvʲɪtɕ tɐˈnʲejɪf]; 25 November [O.S. 13 November] 1856 – 19 June [O.S. 6 June] 1915) was a Russian composer, pianist, teacher of composition, music theorist and author.