Wait, what the hell? Where can you hear Cloud City in-game?
Reposting for the new page:
https://www.youtube.com/watch?v=Ig2cALfpR-M
I think it may be during the mission Infinity, when you're in the jungle. It's giving me those vibes.
edit: Now everyone listen to Armour because it's one of my favorite song in the track as of now.
edit2: Dafuq, why is Halo 3's shit in this? Listen at 9:04