BBC Radio 4 on Instagram: "Russian composer Dmitri Shostakovich was one of the greatest musicians of the 20th century. But in 1936, Joseph Stalin attended a performance of Shostakovich’s opera, Lady Macbeth of Mtsensk. The Soviet leader was unimpressed and left early. Shostakovich was blacklisted from public life, and feared for his safety during Stalin’s ongoing purges. His comeback, Symphony No 5 in 1937 was a big hit with the authorities but his true intentions are hugely debated – some exper