Trent Reznor and Doom 3?

That's right, you can't escape from the nasty man with the loud music. According to John Carmack, speaking at QuakeCon 2000, the man is interested in doing some ambient backing music for the Doom 3 action, presumably somewhat like the midi-style backing present in the original Dooms! Here's a snippet from AMD Zone's article on the very subject..

Check out the whole article at AMD Zone. Also on the topic of QuakeCon 2000, GameSpy have a look at Carmack's speech about consoles and PCs and other bits and pieces.