Khorne, Nurgle, Slaanesh, and Tzeentch.
Holy Terra.
Guest Star:
Marneus Calgar, singing Willy Bum Bum. (Just because.)

Nurgling Carol Singers- We Will Rot You.
Ultramarines Chapter Choir- We Are The Champions.
The Deatwatch Chorus- 1000 Nids.
The Vindicare Assasin- I'm The Invisible Man.
Warp Spiders Quarter- Let's Do The Time Walk Again.
The Necron Lord- Domo Arigoto Mr Roboto. (Look up the Lolcron dance on Youtube. He's doing that.)
Orky Boyz- Orks, Orks, Orks, Orks.
Space Wolves Howling Team- I Will Always Love You.
Dark Eldar 5- Thriller.
Cadian Conscripts Choir- Scream,(Aim)& Fire.
2nd Catachan Regimental Choir- Burn, Motherfucker, Burn.
The Primarchs- Princes Of The Universe.
Lucius The Eternal- Too Sexy.
Noise Marines Band- Hit Me Baby One More Time.
Thousand Sons- It's A Kind Of Magic.
The Deceiver- The Great Pretender.
Tau Choral Cadre- Caravan Of Love.
Khornate Berserker Boyband- Burn, Babies, Burn.

This is an idea I had years ago, I *might* do a proper fic about it, but I'm not sure yet. Enjoy.