Leon Thomas Says Heartbreak Turned Him Into a ‘Bad Casanova’

Leon Thomas is having the kind of year that changes a career. Just weeks after winning two Grammys for his album Mutt, the Brooklyn-born singer, songwriter, and producer is opening up about the heartbreak that helped shape his breakout hit.

Speaking during his European tour, Thomas said the title track from Mutt came from exploring what happens when someone tries to become a player after getting hurt.

“Mutt was a great example of me explaining how a broken heart can turn somebody into a bad Casanova — a Casanova that’s not good at it,” Thomas said to The Guardian. The idea became the foundation for the “doggie” persona that runs through the album: someone who still wants love but tries to hide behind bravado after a breakup.

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That balance between vulnerability and swagger has become central to Thomas’ rise. After years of working behind the scenes for artists including Drake, Ariana Grande, Post Malone, and SZA, Thomas has emerged as one of R&B’s fastest-rising stars.

His 2024 album Mutt became his first project to enter the Billboard 200, while the single “Mutt” climbed to No. 6 on the Billboard Hot 100 and eventually went double platinum.

At the 2026 Grammy Awards, Thomas won Best R&B Album for Mutt and Best Traditional R&B Performance for “Vibes Don’t Lie,” adding to the Grammy he earned in 2024 for co-writing SZA’s “Snooze.”

Thomas said the emotional tension in his music is intentional. “I think you need both bravado and vulnerability,” he explained. “I think those polar opposites living on the same project are really powerful.”

He admitted that spending time around artists like Ty Dolla $ign and other rappers pushed him to write with more confidence. “I was hanging around a lot of rappers, started talking a little crazy,” he said.

Mutt’s success has also connected Thomas to some of the artists who inspired him growing up. George Clinton recently gifted him a custom white hat backstage at Coachella before the pair performed together, while Stevie Wonder personally invited Thomas to take part in a Rock and Roll Hall of Fame tribute to Sly Stone. Wonder later called Thomas to praise “Mutt,” even singing part of the song back to him over the phone.

For Thomas, the moment is bigger than one hit record. The former Victorious star, who began performing on Broadway in productions of The Lion King and The Color Purple, says he feels a responsibility to push R&B forward.

“If there aren’t artists who challenge the status quo of what R&B is,” Thomas said, “it’ll be replicated by people who can’t play or sing a note.”