Kurt Cobain, the iconic frontman and primary songwriter of Nirvana, revealed a shocking fact that he sold his Led Zeppelin and Aerosmith collection for just twelve dollars during an interview in 1991.

Within his extensive conversation with Interview Magazine’s Adam Snyder, the spokesman of Generation X and one of the most influential musicians in the history of alternative rock, Kurt Cobain, talked about his hard-rock roots and his radical shift into punk rock.

In the interview, that came to the fore again, Cobain explained that he completely threw away his hard-rock roots and was into MDC and Black Flag at some point in his career.

Though he learned to play guitar by the songs of The Cars and AC/DC, and fell in love with classic rock even more with Aerosmith and Led Zeppelin, Cobain said that they seemed uncool to him after a period for some reasons.

Kurt Cobain admitted it took him so many years to realize that a lot of Led Zeppelin songs had to do with sexism, the way that they just wrote about their dicks and having sex. That’s why he got pissed off and sold all his collection for a ridiculous price.

He also mentioned that his disillusionment with Zeppelin led him to embrace punk rock since it expressed the way he felt socially and politically, as well as the anger and the alienation.

Here’s what Kurt Cobain said during the interview in 1991:

“I sold my Aerosmith and Led Zeppelin collection for twelve dollars. I completely threw away my hard-rock roots and was into MDC and Black Flag.

Although I listened to Aerosmith and Led Zeppelin, and I really did enjoy some of the melodies they’d written, it took me so many years to realize that a lot of it had to do with sexism.

The way that they just wrote about their dicks and having sex. I was just starting to understand what really was pissing me off so much those last couple years of high school.

And then punk rock was exposed and then it all came together. It just fit together like a puzzle. It expressed the way I felt socially and politically. Just everything. You know. It was the anger that I felt. The alienation.”

You can check out the rest of the interview here.