I used to think that about rock stars like Steven Tyler when he was on American Idol... why don't you just enjoy what you've done and fade away? Then I saw the Sandy benefit special where he sang "Dream On" while playing piano with Perry on guitar. Even after all these years, dude still has it, and his work entitles him to forever hold a part in the spotlight.

If McCartney is covering Cobain, I guess he gets the last laugh. And don't forget, Cobain loved Courtney Love.