“I f–king hate talking, bro,” Leon Thomas tells his audio engineer. The Grammy Award-winning songwriter and R&B singer is rehearsing for his July set at the Hollywood Bowl, where he’s opening for SiR; just days earlier, he was on the other side of the Atlantic performing at London’s Wireless Festival, where his longtime collaborator and friend Ty Dolla $ign crowned him “the king of this s–t.”

Thomas’ résumé includes Broadway stints and a childhood Nickelodeon breakthrough, and he moves through rehearsals with the methodical meticulousness of someone who has been performing his entire life. With his black and red ombré dreads pulled back in a black wrap to complement his plain white T-shirt and black sweatpants, he floats through the Burbank, Calif., rehearsal space with prodigious finesse

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