Most favorite song of all time?

[Gamemaster]

You're Pitful - by Weird Al Yankovic
If Everyone Cared - Nickleback
Civil War - Guns N' Roses

[Light]

Let's see... At the moment, my favorites are:

Still Alive ~ GLaDOS/Jonathan Coulton
Jiyuu eno Shoutai ~ L'Arc~en~Ciel
Harder, Better, Faster, Stronger ~ Daft Punk

I think that's it for right now. I'm sure I like a lot more, but that's all that comes to mind atm. Portal was a great game. =)