Cellist Mstislav Rostropovich (left) performing with singer Galina Vishnevskaya on stage at a concert in Paris, circa 1965. (Photo by Keystone/Hulton Archive/Getty Images)
Cellist Mstislav Rostropovich (left) performing with singer Galina Vishnevskaya on stage at a concert in Paris, circa 1965. (Photo by Keystone/Hulton Archive/Getty Images)