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In early March, Sienna Spiro made her U.S. debut at Los Angeles’ famed Troubadour, enchanting the sold-out crowd with her bellowing, rasped mezzo-soprano as she ticked across her relatively short discography. Still, days later, she recounts the performance through a perfectionist lens: sure, the concert was considered by many in attendance as the official coronation of pop’s next big balladeer, but in retrospect, she’d fine-tune a few things.
“I definitely have some notes to improve the show. Just little things to make it smoother,” admits the London native later that week over Zoom, hours before her encore performance at the venue. “But it’s really insane to do a show full of 500 people somewhere so far from home. I was blown away that people came and people were there. I just couldn’t really believe it, to be honest.”
That incredulity will almost certainly recur for the 20-year-old as she charts her rise from bubbling viral star to what some are already deeming a generational talent. In the past three days alone, P!nk gave a powerhouse cover of her breakthrough hit “Die on This Hill” while guest-hosting “The Kelly Clarkson Show” (“Seeing a hero perform one of your songs is insane”). Sam Smith brought her out in San Francisco to duet on the sweeping tune at their Castro residency (“Singing with Sam is just ridiculous”). And, while in San Francisco, she turned an entire room at Café Du Nord into believers, something she continued to do on each stop of her sold-out “The Visitor” tour, which wraps its U.S. leg tonight with the second of two shows at New York City’s Bowery Ballroom.
All of this has been the culmination of slow-dripping songs for a few years before one of them finally took hold. The track that did, “Die on This Hill,” is the perfect Spiro archetype, a wallop of a ballad where she sings from the depths of her diaphragm about sticking around for a relationship that’s long expired. It’s the type of tune with a passion so raw and genuine that it’ll inspire you to sing it at karaoke until you realize mid-song that, vocally, you can’t. And it’s quickly become her hallmark since its release in October 2025, reaching the top 20 of the Billboard Hot 100 and in dozens of countries worldwide. On TikTok, where it’s been used in 1.1 million videos, countless users have filmed themselves belting along to the emotionally cathartic bridge: “I know nothing could matter / God, I wish something mattered to you.”
For a song as charged and intentional as it is, Spiro recounts writing “Die on This Hill” over nine months of pained trial and error. At first, she was inspired by “Bohemian Rhapsody” after watching Benson Boone perform it at Coachella and attempted to learn it on the piano. “I’m a terrible pianist,” she says, “so I got it all wrong. And then I ended up finding the chords for ‘Die on This Hill.'” Along with Omer Fedi and Michael Pollack, whose credits span everything from Miley Cyrus’ “Flowers” to Rosé and Bruno Mars’ “Apt.,” she did “a hundred” different versions of the song before landing in the right place.
“I was this close to recording [with] a band until I was at the last minute forced to record it as a ballad,” she says. Personally, she preferred the one that sounded most like Silk Sonic. “Omar was like, ‘Just try it, just try it.’ Quite fittingly, I was very stubborn about it. And I was like, no. I was so angry. And I remember I just went with Michael and we did like six takes at the same time. He played piano. And I sang. And then we listened to the first one, and we were all kind of silent. Sometimes you’re wrong, you know? Just gotta listen sometimes.”
It’s surprising, then, that ballads pretty much make up the whole of her discography, which at this point is only a dozen songs. (Thirteen, if you count the live version of “Ain’t No Way” on streaming.) She says she gravitates toward the ballad as an art form because “you don’t really have much to hide behind,” which in turn creates space for more honesty in her music. That’s why, she suspects, “Die on This Hill” has become so resonant in a musical climate that very seldom rewards ballads with mainstream success.
“The song’s about passion and care and being loud and being stubborn. And I really think there’s been this whole movement of nonchalance. Personally, I’m not like that. I’m not very nonchalant. I lay it all out,” she says. “I think people just want to be passionate. People want to care without feeling insecure about that. And I don’t think they should feel insecure about it. And the song, I know it’s so cathartic to sing, but it is just a cathartic song in general. And I think it’s a release. It gives you a feeling of maybe just wanting to be chalant, for lack of a better word.”
The rich, weathered tone of her voice and performance style have already drawn comparisons to Smith and Adele, whose Bond theme “Skyfall” feels like a sacred text for much of Spiro’s work. She’s emerging in a time where British artists are having something of a global renaissance on the back of a new pop vanguard that counts Olivia Dean, Lola Young and Raye. What exactly is it that’s fueling this modern-day British invasion?
“It’s the River Thames,” she jokes. “I don’t know. There are so many amazing U.K. artists now and in history as well. And I think people from England have this innate rawness and honesty. And I think that’s what I love so much about my favorite U.K. artists like Amy [Winehouse], Adele, the Beatles, Lola and Olivia.”
Adele comes up a lot when discussing Spiro, and she’s aware of the frequent comparisons: “I mean, she’s the greatest. It’s a very high compliment and a very scary thing for people to say. But you know, I’m just so flattered. I know I’m my own artist and getting compared doesn’t really make me feel insecure. It’s crazy to be even mentioned in the same sentence as her.”
At the Troubadour, Spiro debuted her new single “The Visitor,” which arrived last week, and teased it with a custom paper dress that touted the song title among images of the Chateau Marmont and iconic Capitol Records building. (She’s signed to Capitol, where she’s a high priority.) She introduced it by noting that it’s not about the heartbreak of a doomed romance, but rather the loss of a friendship, an unusual twist on the breakup song format. It took her nine attempts to write it because she’s “so aware of things ending,” she says. “I hate getting given flowers because they can die. And I’m not scared of death, I’m just scared of things ending. And it’s just this theme I’ve had across my entire life. I really wanted to get this feeling encapsulated perfectly.”
Spiro refined her songwriting while growing up in London, penning her first songs at the age of 10. She knew she wanted to pursue music and, at 16, went behind her parents’ backs to apply to East London Arts & Music, which counts Kwn and members of Flo as past students. She had dropped out of her previous school in hopes that she’d be accepted. She wasn’t. “I remember I was at Reading Festival and they were like, ‘You didn’t get in.’ I was emailing them every day, every couple of hours. I kept sending videos of me singing. Oh my goodness, I was doing the most.” Eventually, they admitted her, but her tenure didn’t last long. After she posted a TikTok cover of Finneas’ “Break My Heart Again,” labels came calling, and she dropped out.
She released her debut single, “Need Me,” in May 2024, and took trips to Los Angeles to record new music. Just shy of two years later, she’s working on her full-length debut, which is expected to be released later this year. Looking back, she explains, she still can’t believe how far this all has gotten. “I mean, look, I’m delusional and I always wanted to do this,” she says. “I love music and it’s the only thing that makes sense to me. I’ve always wanted to do this and I can’t believe it’s actually happened. I’m very grateful it has.”
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