Straight A's, a county speech title and a place in NBC's Live Shows make up the unusual mix in 15-year-old Delano student Koumba Cariño Diallo's year. After turning all four chairs on The Voice, she is heading into the live rounds on Team Kelly.
Diallo auditioned on her 15th birthday, turning a long-held dream into reality, according to turnto23.com. Her performance of Demi Lovato's “Stone Cold” earned a four-chair turn, as reported by news.kern.org. She chose Kelly Clarkson as her coach and became the first artist Clarkson selected to advance straight through this season, according to 23ABC News Bakersfield.
The announcement caught Diallo off guard. She told 23ABC that her heart was pounding and she was spacing out when Clarkson said she was moving forward. “Music is a feeling,” Diallo said. “It's really a feeling.”
A Brother Who Connects Through Song
Diallo is also balancing school, family and the competition, 23ABC reports. Her 7-year-old brother Omar, who has autism and is nonverbal, engages with her audition at home: he plays it back and joins in, and sometimes imitates pressing a judge's button, according to 23ABC.
Diallo has said representing her hometown is an honor and that she is grateful for the support. Her performances have also taken her beyond Delano: she has appeared at USC Women's Volleyball games and LA Clippers games at Crypto.com Arena, according to news.kern.org, while keeping up academically.
Straight A's and a Trophy Case Full of Wins
Her school's principal said Diallo has continued earning straight A's even as the spotlight has grown brighter, per the Kern report. Last year she won first place overall at the Kern County Superintendent of Schools' 2025 Henry Greve Speech Contest, and she was also named a 2025 STEAM Olympiad winner with her team in the Chalk Talk competition, the same source states.
A Long-Running Speech Contest
The Kern County Superintendent of Schools says the Henry Greve Speech Contest was established in 1955 for 7th and 8th graders. Its past-winners list identifies Oladoyin Oladimeji of Earl Warren as the 2024 champion, the year before Diallo's 2025 win, according to the Kern County Superintendent of Schools.
What Comes Next on The Voice
Diallo is set to perform Monday, November 16, with voting opening at 6 p.m. Pacific time that day, as noted by 23ABC. Viewers can cast a vote by texting Koumba to 22854. She's one of a smaller group of artists left standing after Cut Week, when, as nbc.com reports, each coach trimmed their team from seven artists down to three ahead of the Live Shows.
This season also brought new ways for fans to weigh in. NBC added SMS text voting and TikTok voting as additional options for Season 30, the network's insider site notes. Voting for the Live Shows kicked off November 9 and will continue weekly through the December 14 Live Finale, per the same NBC account.
For now, Diallo's path runs through Monday's performance, with a hometown — and a little brother who already knows every beat of her audition by heart — watching from Delano.
