Nirvana drummer Dave Grohl discussed Nirvana’s collaboration with Paul McCartney and its significance in the Sound City film in a new interview with Rolling Stone:

“Part of every discussion with the musicians was about the human element of making music. Feel, imperfection, emotion, the conversation as a player, conversation between players, craft. All of those things we talk about in the film, but I thought it would make those things more clear if we demonstrated them. If you’re talking about spontaneity and connecting in a moment, the McCartney/Nirvana segment makes perfect sense. I wouldn’t even have to say that, you just watch it and think, Wow, they just walked into a room together and made something explosive out of nothing because of the energy in the room. It could take years to explain how or why that happens, but if you see it, those seven minutes make perfect sense.”

“It was nuts [being in the studio with Paul McCartney]. The funny thing about musicians from that generation is that they’re pioneers. The reason why they changed the world is that they were doing something that no one else was doing, and they weren’t scared to do it. So when you play with Roger Waters or John Paul Jones or Paul McCartney or Mick Jagger, they’re not afraid to get weird. It’s our generation that gets safe with music. A lot of people from my generation of music are so focused on playing things correctly or to perfection that they’re stuck in that safe place. They’re not willing to, like, fuckin’ get rad. And Paul definitely is. That day was really funny, because honestly, Krist [Novoselic] and Pat [Smear] had never met Paul before and they were very nervous – they were terrified. The Beatles meant the same thing to all of us. I mean, without the Beatles we wouldn’t be who we are. So when we started playing for the first two hours, maybe, we were so in awe of Paul that we forgot about Nirvana. It took a few hours before I realized, wait a minute . . . we haven’t done this in maybe 20 years, Krist and Pat and I – wow, how cool. And fuckin’ Paul is here, too.”