Following upon their previous Grammy-winning releases on Deutsche Grammophon of Shostakovich’s Symphonies Nos. 5, 8, 9, and 10, this new set from Andris Nelsons and the Boston Symphony Orchestra turns to two symphonies written in the shadow of World War II: Symphony No. 7, Leningrad, which represents the resistance of the Russian people to the Nazi siege of that city, and the rarely heard, multi-faceted Symphony No. 6. The incidental music that Shostakovich wrote between the symphonies for a 1941 production of Shakespeare’s King Lear and the 1954 Festive Overture are also included in this two-disc set.