Here's the clip that aired on South Park:
Nirvana joined the Rock and Roll Hall of Fame in their first year of eligibility, alongside Kiss, Peter Gabriel, Hall and Oates, Cat Stevens and Linda Ronstadt. Michael Stipe, from R.E.M., inducted Nirvana into the hall of fame saying "Nirvana tapped into a voice that was yearning to be heard. Nirvana were kicking against the mainstream. They spoke truth and a lot of people listened."
Here were the four Nirvana performances during the show:
Joan Jett joined Nirvana onstage to perform "Smells Like Teen Spirit"
Kim Gordon, from Sonic Youth, sang "Aneurysm" St. Vincent performed "Lithium"
And Lorde sang "All Apologies"