During season 30 of The Voice, 15-year-old Koumba Diallo impressed all four coaches with her powerful rendition of Demi Lovato’s “Stone Cold”. Riley Green and Adam Levine traded jokes about Levine’s age, while the coaches praised Diallo’s vocal range, stage presence and potential.

Green called it “the most perfect performance” he had seen, but Diallo ultimately chose Kelly Clarkson as her coach. Clarkson stressed the importance of song choice, while Levine and Green continued their playful “Grandpa Adam” rivalry, despite Levine pointing out that Green is nearly 40.