Shostakovich’s final opera, Lady Macbeth of the Mtsensk District, has had a rocky history. It was a smash hit when first performed in 1934, but it was officially condemned by the Communist Party two years later for its sympathetic portrayal of a triple murderess. Nowadays, it hovers on the fringes of the standard repertoire (barely making it into Operabase’s 100 most-performed works globally last season). It’s exciting to see it newly staged at the Salzburg Festival this...