The sound(track) in the Background!

[Scarecrow]

Brutal Legend. I just love metal so for me it had the most amazing soundtrack.

 

[_Janny_]

The Silent Hill series, IMO. Not only is it atmospheric as hell in-game, it's also great to listen to outside the game. Some of the sounds/songs there are pretty damn unique, too.

 

[theComposer]

The Legend go Zelda: OoT and WW both had awesome soundtracks. Both of the Super Mario Galaxy OSTs are phenomenal as well.

 

[JemothSkarii]

Three Words: Metal. Gear. Solid.
Any of them.

 

[SL33TBL1ND]

Omega Boost. That game's music was awesome.

 

[shado_temple]

As of recent, I'm going to have to go with Mass Effect. Jack Wall really sets the mood for each setting, giving each its own "feel". "Suicide Mission [http://www.youtube.com/watch?v=VTsD2FjmLsw]", I believe, is a good example of such a thing.

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