The former Beatles’ member Paul McCartney fondly referred to Kanye West as “a monster” while discussing a recent collaboration with the hip-hop artist.

“I love Kanye, people say he’s eccentric which you would have to agree with but he is a monster… he is a crazy guy who comes up with great stuff” McCartney told an audience, which included Brad Pitt, at a Mastertapes session at the BBC.

Speaking of their collaborations, McCartney revealed that Oprah Winfrey warned him to not be associated with West’s track All Day— which has a melody written by McCartney inspired by a Picasso painting— due to its repeated use of the N-word.

“People like Oprah, who’s a little conservative about that stuff, said, ‘You shouldn’t do it, even black people shouldn’t use that word. I said, ‘Yeah, but it’s Kanye,” McCartney told the BBC. “And he’s talking about an urban generation that uses that word in a completely different way.’ It’s the context. So I was actually pleased with it.”

A filmed version of Radio 4’s Mastertapes with Paul McCartney is available on the Radio 4 website. The full, extended interview will then broadcast on BBC Radio 4 on May 28, 10-11am.