Who is the most offensive band 20th Century popular music?

Isn't that the standard response nowadays whenever a celebrity says something they regret? 'It was taken out of context', subtext: 'don't blame me for saying something stupid, a slimey-asshole-journalist-type made it all up'.

The only example I can think of right now is Charlotte Church for those 9/11 remarks that were discussed round here a while back. Could it be that she is the most offensive person in popular music?

Are Skrewdriver or Mayhem any good, given that you could ignore the behaviour of the people in those bands (and maybe the lyrics too)?