If there ever was a band that was an incarnation of 40K-style Chaos it was GWAR. I had many, many gaming sessions with GWAR on in the background. Clever lyrics full of over-the-top cartoony violence and sex, and then some more violence, they were not everybody's cup of tea. I saw then live several times with fellow Warlord Jeff, we escaped covered in stage blood and other alien fluids. It was great.
Sadly today, Dave Brockie, the human alter-ego of Oderus Urungus was found dead in his home. USA Today has a write-up here. He brought a lot of joy to our black hearts, he will be missed.
"From my fortress in Antarctica
watch the world die
On my Sony Trinitron that's switched to channel 5."