The women's free skate program on the Olympics last night was an altogether impressive show. During which, I was really intrigued by the dark music that accompanied Mao Asada on her silver-medal performance. So a little Google magic later, I've identified it as Sergei Rachmaninoff's Prelude in C Sharp Op. 3.
Originally a composition for the piano, Mao skated to an orchestral version like the one shown below by the Kremlin Chamber Orchestra.