Dead Space.
It's not like this is catchy or anything but it's incredible. Amazing foreboding atmosphere. What makes it even better is as far as I can tell, there's either several variations of the theme, or it's just somewhat randomized cuz I swear I hear different shit every time I hear it.
No way I'm leaving my top 5 to 3 or higher game of all time off this.
Perfect Dark
I remember the first fuckin' time I opened up that menu.