Also from Origins, Le Ali Del Principio. Words don't do it justice; just listen to it. The music alone is incredible, but the hauntingly beautiful vocals make the piece almost impossibly wonderful...especially considering the fact that the vocalist was the composer's nine-year old daughter.
The entirety of both games are a pair of crowning soundtracks of awesome. Even the worst songs are simply above average, and if a song is even average compared to the rest of the soundtrack, it still sounds amazing compared to other games. There's a reason the soundtracks are collectively considered Motoi Sakuraba's best work.