Three years ago, Rihanna, Paul McCartney and Kanye West united for the most iconic collaboration of our time known as the song "FourFiveSeconds." In a recent interview with DIY, McCartney reflected on the entire recording experience and shared some of the most valuable things that he learned from the rapper.

"With him, it was much more made up as we went along- so much so that I didn’t even realize that I was making songs," he said. "I was tootling around on guitar, and Kanye spent a lot of time just looking at pictures of Kim [Kardashian] on his computer. I’m thinking, are we ever gonna get around to writing?! But it turns out he was writing. That’s his muse."

Despite the differences in their creative processes, Kanye ultimately inspired McCartney to break out of the routines that he had been holding himself to since he started his career with The Beatles. Embrace the nostalgia and watch the music video for the 2015 single below.

In related news, this is how Rihanna turned her fame into a full-blown business empire.