That would be Count Cain from a manga by Kaori Yuki, the mangaka of Angel Sanctuary. I'm not entirely sure what the manga he's from is called, but from what I can tell it's "God Child" and it's not translated into english yet. (Why, does that mean you're making a trip to Kino soon, Sky? Yes it does, friendly voice in my brain!)

So... tell me what song so I can DL it? *smiles sweetly at you*