Hmm from the top of my head ... :
I love Nubou Uematsu. Masashi isn't bad either, but it takes time to conquer my heart!
So I like most of the
Final Fantasy soundtracks by default; specially
VI to X. I dug XIII's, too. Also like the versions of the Black Mages
Don't think I need to give examples ... people know these.
Also love the soundtrack of
Obscure 2. Has some really haunting pieces (like "Lumen") and always established a perfect mood. But also had kickass pieces like "Waltz of death".
Olivier Deriviere did an amazing job for this game. Also an awesome coop game! Horror for two :P
Also liked the Ost of
Beyond Good & Evil. That was a soundtrack with a wide variety and always fitted the scenes.
"Akuda House Propaganda", "Slaughterhouse Scramble", "Fear the Reaper" and "Dancing with Domz" were my favourites.
Looking forward to the next installment :3
Shadow Hearts (1, 2
& 3) had a nifty OST. A good RPG should have everything for every mood and they do.
Only putting one, but they had a lot of different sounds; some electro and spiritual sounding at the same time.
Uh almost forgot because so recent -
Heavy Rain. I'm a sucker for orchestras XD