Composed over a period of nearly 50 years, Dmitri Shostakovich’s 15 symphonies are astonishingly diverse in conception and expression, reflecting the composer’s personal experiences, the history of the 20th century and the tensions and struggles of an artist under the Soviet regime. These recordings fulfil a promise that Mstislav Rostropovich made to the composer, a close and long-standing friend, before he left Russia as an exile in 1974. “These symphonies mark fifteen stages in our lives,” he said. “The emotional history of our country, my history, his history, our history.”