Iggy Pop on American Idol......why is it that so many "legends" can't sing AT ALL!?!?

How true but its funny to see all the names there that are millionaires so someone is loving it all. Not me I'm with you. I would prefer to hear what they are singing. Iggy Pop was disgusting and I put it on mute and walked away until it was over. He was disgusting to look at. Who wants to look at a wasted man on stage with no shirt on, ugh. Why did they have him on? Someone screwed up in the production department.