Ok, I know this is starting to get heretical, but you keep mentioning people I have missed out. There should only be one more after this.

Judges:
Khorne
Nurgle
Slaanesh
Tzeentch
Guest Star: Inquisitor Eisenhorn singing Surfing Bird. (Lets face it, he's the only person in the galaxy who could sing that song with a straight face!)

Rogal Dorn, Roboute Guilliman, Jaghatai Khan, Corax, Vulkan, Ferrus Mannus, Leman Russ, Sanguinius & Lion El' Jonson- Too Legit To Quit.
The Tyranid Hordes- Nom Nom Nom Nom Nom Nom Nom.
The Blood Angels Chapter Choir- Perhaps Vampires Is A Bit Strong?
Imperial Navy Choir- Don't Rock The Boat.
Rebel PDF Regimental Band- Fight The Power.
Penal Legion Band- I Fought The Law.
Keeper Of Secrets- Hush.
The Death Company- Bleeding Love.
The Daemonettes- Rape Me.
The Bloodletters- Ain't Nothing But A Flesh Hound.
Kyriss The Perverse- Gimme Gimme Gimme A Man.
162nd Cadian Sappers Regimental Choir- Tick Tick Tick Boom!
Peturabo- Paranoid.
Khorne, Nurgle, Tzeentch, and Slaanesh- Friends Will Be Friends.

Only one more to go. Hopefully.