[killerstorm]

That's actually not true. Cobain used a rather "weird" technique where he would "accidentally" hit 4th in addition to 5th. That actually has characteristic Nirvana sound and is sometimes called "Cobain chords". Assuming Cobain doesn't hit any other strings these are sus4 chords.

Here's a video with some analysis of "Smells like teen spirit": https://youtu.be/Xambk1JkWrE?si=aV-kCj1JsbMdM_AV&t=137

I find it really weird that people claim these are power chord even though they sound really different. In my view they are important to the vibe of "Smells like teens spirit" as they bring some dreamy characteristic as they make it a lot brighter compared to what it would be if it was played with only two lowest notes.