The general rule seems to be the this: artist covers Nirvana, artist butchers Nirvana. This of course may just boil down to a simple fact that Nirvana just don't cover well, it happens. So if your going to cover the anthem of the 90's you had better be god damn good. It's a good job Patti Smith falls into that category. I'm yet to hear a Niravna cover that was better than the original but this comes close. Patti rules!!!