Fucking Zachariah Scott, man. He is a visual genius, and his partnership with composer Lars Erik Fjøsne is a genius beyond comprehension.
The video above is a Turret Anthem, internally known as Megadub, and it's a fantastic song. The video is great too, of course, as you watch the tiny turrets slowly overtake GLaDOS in her confusion.
Definitely something I will listen to on repeat.