The difficulty with some people is that it is hard to sing their songs without imitating their voice and styling, so that anyone else doing those songs unintentionally parodies them. The prime candidates are Dylan, Baez, Neil Young and Elvis Costello. I don't like listening to any of these, because it makes my voice do funny things when I don't expect it. Axel Rose, on the other hand, is not even worth imitating unintentionally. I've heard better-sounding squeaks from Ford axles without lubrication, and one look at Mr Rose in performance will tell you he's lubricated!