Source here:
http://www.andriasang.com/e/blog/2010/02/02/nier_date/
EDIT: Figured I'd add this here too since I am dying to know the composer(s).
http://www.square-enix.co.jp/nier/
The music is absolutely gorgeous. I love the piano and vocal theme that plays when you load the website and the two subsequent themes that play respectively on each version. My only guess at the moment is Yoshiki Aoi...