Punk is musical freedom. It's saying, doing and playing what you want. In Webster's terms, 'nirvana' means freedom from pain, suffering and the external world, and that's pretty close to my definition of Punk Rock. Kurt Cobain
Kurt Cobain thereore has become a part of a small circle of pop-rock singers which inspires creative minds of contemporary artists. Like Michael Jackson or Prince for example.
All additional information about the exhibition, as well as the video, or a slideshow may be found here:
http://www.seattleartmuseum.org/exhibit/interactives/kurt/default.asp
PS: SAM (Seattle Museum of Art) has an exhibition of the media works by Andy Warhol ongoing at the same time.
image from: http://www.seattleartmuseum.org/exhibit/interactives/kurt/default.asp