Yulia Deyneka, principal violist of the Staatskapelle Berlin, has long been part of the Pierre Boulez Saal’s artistic family as a chamber musician, member of the Boulez Ensemble, and professor at the Barenboim­-Said Akademie. Denis Kozhukhin, her partner for this long-­delayed duo recital, is himself a regular guest. Together the two artists perform works by Russian composers, including a rarely heard sonata by Prokofiev contemporary Nikolai Roslavets and Dmitri Shostakovich’s final work, completed in July 1975 just weeks before his death.