That Doctor Who song was amazing. Amber and I approve.
Schaeffer the Dark Lord
Captain Dan and the Scurvy Crew
Austrian Death Machine - Sounds like you might have this covered from earlier conversations.
Weird Al, obviously. Alpocalypse is the newest album.
Lemon Demon - so many good songs
John Cheese - because listening to jazzy/swing versions of Disturbed songs are awesome.
Jonathan Coulton - Author of the Portal 1 theme - Skullcrusher Mountain - RE: Your Brains
Weezer - Must I list good songs? There are so many...
Zombie Ninjas: http://www.songstowearpantsto.com/songs/zombie-ninjas/
Amber suggests the bands: Hum, Failure, Hopes Fall
Hopefully that gives you an hour's worth of material to work with.