As heard in the Hitman (2007) Soundtrack, the new Prototype teaser (which looks awesome, btw), and many many more movies and games.. What is it? It must be some standard piece of audio, perhaps from a classical piece? I don't know. Maybe someone can shed some light on it. It's been bugging me for a while now >_>

 

Edit: The tune in question starts around 0:50 in the Prototype trailer.