On Sunday 9 August 1942 in Leningrad, a concert took place that defies belief. A year earlier, the Germans had begun the deadliest siege in history, which would kill 750,000 civilians. Now, in the midst of terror, a group of starving musicians assembled to perform Shostakovich’s 7th Symphony. It would become a defiant moment in the city’s ultimate survival. Through music, archi......