Oguro Kumiko (nee Noma Kumiko)

Does anyone know anything about this opera singer? All I know is she provided the theme for the rather freakish anime "Elfen Lied" (a haunting song styled ecclesiastically called "Lilium") and I can't seem to locate any more information about her. I can't find any parts she's played or anything- she doesn't even seem to have a website. I find her voice captivating and she's GOT to have done more than that anime- when you're Japanese, you don't learn to properly pronounce Latin just for a bloody anime theme.

Anyone have a clue? Any help would be highly appreciated. She really does have a lovely voice.