Ah, I knew I'd heard the Baten Kaitos one somewhere else before, and I found it.
Soul Poetry from
Baten Kaitos (0:43 seconds in) is also heard in The Attackers from
High School of the Dead (at the very beginning). It's altered but it's the same thing essentially. EDIT: Oh, we have it as "Assailing Ones", same difference, it's track 4.