Excellent mentions. All of these games provide such a pleasant atmosphere.

fucking jade empire.

or p.n.03

probably jade empire.

Diablo 1 and 2

There are soooo many really awesome game soundtracks out there...
The Hitman games got great soundtracks (except Absolution, that was unimaginative crap):
The whole soundtrack from Silent Assasin
Contracts main theme just got the whole atmosphere of the game spot on
Also in Contracts you can hear some melodies from Blood Money but with distortion which is a really nice touch considering the setting of the game.
Finally after Absolution we got some exciting themes again, even if it sounds like it came straight out from an action spy movie.

The two MAFIA games got great main themes:
Mafia 1
Mafia 2

I really liked the main theme of Batman Arkham City

Indiana Jones and the Emperor's Tomb soundtrack captured the feeling of the original films soundtrack nicely.

And many, many more..........

The music that plays during my all time favorite gaming sequence : The Blade Runner balcony

Runner up : The music that plays as you walk in the streets of the snow covered town at the beginning of Icewind Dale 2

I think there's too much good music out there, in general, for people to pick a single "favorite". :)

Got many songs in too many diferent games to name, but I admit that really enjoy themes by The Black Mages (FF):
https://www.youtube.com/watch?v=YDlYtFpEHAA&list=PL6BE1C0F958B8261D

I'm greatly surprised by the music in Shadowrun: Hong Kong, which I recently acquired:
https://www.youtube.com/watch?v=00-yCMBkkiA

Freedom Planet:
https://www.youtube.com/watch?v=tei9eGf8tDs&list=PLXboV09BFPyp70EFrcVf9o49LmJcjATms

Bastion:
https://www.youtube.com/watch?v=oLA0vB9LCTM

The Banner Saga:
https://www.youtube.com/watch?v=glXeCbFjh-o

These have great music too.

Somehow, despite not liking the game itself anymore, I still have in my mind the magnificent music played in the Howling Abyss map of League of Legends:
https://www.youtube.com/watch?v=rSJ-Uq9r9j0

But I'm being unfair naming only those: there are too great many soundtracks out there.

Favorite score:Silent Hill 2

Favorite soundtrack:Hotline Miami

Favorite OST is most likely: Xenoblade.

Close runners up are: Baten Kaitos: Eternal Wings and the Lost Ocean, Castlevania: Rondo of Blood, and Yoshi's Island.

I have to say, GRAND THEFT AUTO 1!

Vampire Redemption and Bloodlines. I loved theirs. Especially bloodlines, which featured the work of real music bands (but i also hate it for this, since it gave to the game copyrights hell).

Blade of Darkness.

Those are my top ones in the list. I am sure i had a bunch of others, more games that i am certain they captivated both my ear and interest, but now at early dawn, i am lazy to think harder.

Myst II-IV are probably my favourites.

The Vanishing of Ethan Carter
Mass Effect
Bioshock
Witcher

Interesting example of sound progression in those three, just in terms of how music evolved throughout the series.

In terms of Jack Wall's body of work (and as far as his input on the Myst series goes) I know most critics consider his work on Myst IV to be something of a career defining moment (and I'm not really disagreeing) but there's something about the music he did for Myst III that just grips my attention unrelentingly.

This topic AGAIN!??!

well then! again!

I love a lot of music from a lot of games, but I don't think anything comes to mind more immediately or comes close to topping:

Interstate '76

See , or the extended list [url=http://ua.reonis.com/index.php?topic=1153.msg44814#msg44814]here.

And here's another one of my current favorites:
Dynamedion - Madas Licht (Drakensang: The River of Time)

Sacred 2 Blind Guardian concert They actually incorporated band members and small quest in game story :) . Also there is Brutal Legend with an amazing metal setlist.