I have tagged those with Graeme Norgate, because of what Graeme said:
"I think all the main tracks I did for the game are on my site, and the little stings and sound effect tracks were mine."
Edit: It turns out Citadel has the same song as the multiplayer level "Complex", so I might actually retag the track title to that. This might also be the reason why one of the composers were confused by "Citadel". The developers were probably just going to re-use the Complex track for the Citadel level.
Also, I was unaware of the Surface 1 X song. Does anyone have a USF with that track included?
http://tcrf.net/Notes:Goldeneye_007