I found some TF2 songs that are pretty great!
Erectin a BOOM: Youtube.com
desreveR MOOB a nitcerE: Youtube.com
Sniper's Godly Knife: Youtube.com
Heavy's New Weapon: Youtube.com
I'm Moovin' Nis: Youtube.com
WAR!: Youtube.com
Heck, there're a whole bunch more, but these are the ones I like the most :)
(The second one is "Erectin a BOOM Reversed in case you didn't figure it out)