What was the Classical song that Hines Ward & Kym Johnson was dancing to on DWTS?

Dancing with the Stars had a classical theme last night and there was a song on there that I really like but never heard before. It has a classical thriller/rock feel and Hines and Kym were dancing to it. Does anybody know the name of the song and who wrote it and what orchestra has it recorded on an album so I can get it on amazon or itunes?