Are we talking about the Nirvana song? If so, it's F - A# - G# - C# over, and over, and over, and over...............
Oh, yeah, there is a little bridge part, isn't there? Not sure about that one.
Okay, you've sparked my curiosity, what you doing with that one?
You can look around at
www.e-tabs.org , but I think the couple I looked at were a bit off. I don't ahve a guitar in front of me to check 'em.