Or, Xenosaga: Episode III ~ Also Sprach Zarathustra to give it it's full name...
http://ps2.ign.com/objects/757/757372.html
Apparently the last episode in the saga.
If I am not mistaken, is this not the name of the main theme tune to 2001: A Space Odyssey, by Richard Strauss?
Another coincidence - The series is made by a company called "Monolith" ~ Am I the only one that sees a trend here?