I'm surprised none of ya'll posted any of her work from Wolf's Rain, which is glorious. Have to agree with Anteater on this one, it's her masterpiece.
This is probably one of my favorite anime songs of all time; I love how it changes in tone and the ending rounds it off so amazingly, I wish it continued on for just a little bit longer!
Arguably some of the finest songs from the anime didn't even make it onto the OSTs, which is a super big shame. Luckily some of the people of youtube have managed to isolate/cover the songs enough to make them listenable.
Muuuuch more where that come from, highly recommended anime and soundtrack