Best game OST?

Carmageddon 1 - u can play the cd in your hifi ;D

or
Duke Nukem 3D

NSFW... At least for some.

From the games that I've played:

MediEvil

The Legend of Zelda: Ocarina of Time

Dust: An Elysian Tail

Mafia

Trine

Tombi!/Tomba! had fun OST.

I'll say only this: "I don't want to set the world on fireeeeee"
:D

轩辕剑三外传：天之痕, even though its production was rushed.

Bastion. hands down

Guild Wars 1

Hmmm, though question, but I have an "retro answer" for you CLICK

I actually taped this music as a kid :D

Guess I am a nerd :S

I quite like Stealth Bastard Deluxe's OST.

i liked the gran tourismo 3 and hotline miami ost

Transistor

Shatter.

http://www.youtube.com/watch?v=8J4y11O1H34

payday 2 http://youtu.be/3BYQeWzWOic?t=13m30s

Chrono Cross, there isn't much anything else like it

Hotline Miami. Bastion. Portal 2. World of Warcraft, or W3, Dustforce... Probably many PS1, PS2, Gameboy, Gamecube, Sega games too but too many to remember.

The one I've heard the most is probably Bastion, tho. Those songs don't really feel like listening to game OSTs. They're just nice songs on their own right.

Mass Effect and Final Fantasy X are great. My favorite is probably Mirrors Edge though.

Castlevania SoTN
Suikoden 2
Vagrant Story
Xenogears
more...

Quake series or UT series

Battlefield 2: Modern Combat

https://www.youtube.com/watch?v=bxQObFA93V0&list=PLAC506814EB4AC831

This question gets asked every week, and every week the answer is the same: Jet Set Radio and Jet Set Radio Future, Deus Ex and Deus Ex Human Revolution, and Bastion.

I love Mark Morgan's work on Fallout

I can't believe no one mentioned Halo yet.

The Witcher Series, Payday 1 + 2, Hitman Blood money :D

Suikoden 1 & 2.