I agree with a lot of dangermouse's choice, particularly Bill Hicks. This is my favourite Hicks quote:

-"Oh come on, Bill, they're the New Kids, don't pick on them, they're so good and they're so clean cut and they're such a good image for the children.' Fuck that. When did mediocrity and banality become a good image for your children? I want my children to listen to people who fucking rocked. I don't care if they died in puddles of their own vomit. I want someone who plays from his fucking heart."

As well I'd have to say Maynard James Keenan and Bob Marley.