Metal Gear Solid needs little introduction, it basically started a new genre of stealth games.

The soundtrack of has some nice atmospheric tracks: you can buy the soundtrack on Amazon.com. Metal Gear Solid has a very atmospheric background soundtrack, with the emphasis on background..you won't find anything that really stands out in the music (no guitar solos here).

A favorite is 'Furnace' which you hear while running around a blast furnace (surprise surprise). It has a drive and intensity to it that matches the heat and molten steel around you nicely.

Another cool track is 'Discovery', with its radar ping sounds in the opening.