Props go to Mental Floss for coming up with this unexpected find. Back in 2011, in Tokyo, 167 musicians performed some classic Beethoven with the “Matryomin,” a new-fangled instrument that lodges a theremin inside a matryoshka. A matryoshka, of course, is one of those Russian nested dolls where you find wooden dolls of decreasing size placed one inside the other. As for the theremin, it’s a century-old electronic musical instrument that requires no physical contact from the player. You can watch its inventor, Leon Theremin, give it a demo in the vintage video below. And via these links you can see the Matryomin Ensemble performing versions of Amazing Grace and Memory of Russia.