'''Symphony No. 12 in D minor''', Op. 112, subtitled ''The Year of 1917'', in 1961, dedicating it to the memory of Vladimir Lenin, leader of the Bolshevik Revolution, as his Symphony No. 2. The symphony was premiered that October by the Leningrad Philharmonic Orchestra under conductor Yevgeny Mravinsky. This was also the last Shostakovich symphony which Mravinsky premiered; his refusal to give the first performance of the Thirteenth Symphony, ''Babi Yar'', caused a permanent strain in their working relationship.Wilson, 406, 416-17.