“Un x100to” is a song about a man who uses his last 1% of phone battery to call his ex and admit he never moved on. The whole track exists to prove he has nobody to blame but himself.
That premise is almost annoyingly small for a global number one. And yet the song hit the top of the Billboard Global 200, cracked the Hot 100 top 10, and turned a norteño band from McAllen, Texas into one of the biggest Latin acts anywhere.
The title is a stylised shorthand: “un x100to” which is “un por ciento,” Spanish for one percent. That detail is the whole song. Everything is running out. The phone battery is the last honest moment he has left, and the song is built around what he does with it.
Payo Solís, Grupo Frontera’s lead vocalist, carries the first half. His voice sits in the traditional norteño register, warm and thick with a quality the genre calls llorón, a kind of built-in ache that trained vocalists spend years cultivating. Nothing makes him laugh anymore. He went out with someone else and she was wearing the same perfume. He gets high to sleep because he sleeps better when he dreams she’s still there. He wrote messages he never sent; they’re all still on his phone. Then the line that twists it all: maybe he did her a favour when he left. He sees her Instagram. She looks better without him. That hurts more than anything else in the song, and Solís delivers it without a single theatrical note. The accordion answers him like it can’t help itself, slipping up between vocal phrases the way bad feelings come back when you stop concentrating.
Producers Edgar Barrera and Mag Borrero built the track from the ground up starting with just an acoustic guitar and Barrera’s vocal, stripped back enough that Grupo Frontera heard it and committed to recording that same day. The cumbia rhythm they eventually built underneath it doesn’t push. It loops. The bajo quinto, the ten-string guitar at the core of every norteño arrangement, locks into a pattern that keeps returning to the same harmonic place, the same chord you just heard, the same feeling you just processed, still there. The percussion, congas and timbales swaying inside the drum kit groove, gives the track its danceable momentum but the loop keeps pulling back on itself. The structure of the music is doing what the narrator is doing: circling.
When Bad Bunny enters, Barrera confirmed he introduced dark pads, electronic drones that press into the mix like something unresolved sitting underneath the surface. The sound shifts toward his reggaeton roots but the cumbia foundation holds. Both worlds coexist without either one smoothing the other out, and that is where the song stops being a heartbreak song and starts being a confession. Bad Bunny’s verse says what Payo Solís was too careful to say. He knows she’s doing well. He knows she doesn’t want to hear from him. Then: “living in a hell I started myself, playing with you like I was a number ten.” The guilt is explicit. He wasn’t the heartbroken one; he was the one who caused it, and now he’s drunk on her Instagram, drowning in tequila, going out with other people who remind him of nothing. His baritone has a rhythmic, almost spoken cadence that sounds almost convincing when he insists he hasn’t been thinking about her, until the speed of the delivery gives him away.
Grupo Frontera didn’t know Bad Bunny would be on the track until the day they arrived at the video shoot. Barrera had already written the song with the band in mind, pitched it to Bad Bunny’s camp, and the collaboration built from there with Barrera sitting down with Mag Borrero to produce the version that exists now. That sideways arrival is in the song somewhere. The two voices are telling the same story from genuinely different positions. Payo Solís is consumed by sentiment. Bad Bunny arrives and names the damage. The intimacy between them wasn’t engineered in a writing session. It sounds like it because neither one was performing it for the other.
Bad Bunny had called himself a devoted fan of regional Mexican music before this. After headlining Coachella 2023, the biggest Latin act on the biggest available festival stage, he turned around four days later and dropped a song about being drunk at 1 a.m. scrolling through someone’s Instagram. That contrast landed hard when he previewed it on TikTok with his cumbia footwork, and it says something about where his instincts go when he’s not performing spectacle. This was only his second time working in the regional Mexican format, following a corrido remix with Natanael Cano, but the corrido is a genre built around bravado. Cumbia-norteño is built around feeling. He didn’t just guest on it; he went inside it.
Grupo Frontera’s previous ceiling was “Bebe Dame” at number 25 on the Hot 100. “Un x100to” nearly quadrupled that. The chart impact was part of a wider moment: Peso Pluma’s “Ella Baila Sola” was charting at the same time, regional Mexican music was crossing into mainstream visibility for the first time in years, and the question was whether that was a genre-wide shift or just individual momentum. “Un x100to” answered it differently than those other tracks. It didn’t lean on the novelty of the fusion. It used the genre to tell a story about someone who can’t stop being the worst version of himself, and it used the music’s history to make that feel true.
The norteño sound carries traces of Austrian-Czech polka that migrated into northeastern Mexico with immigrant communities along the border. That’s not incidental; it’s why the accordion runs in that particular register, why the rhythm sits where it does, why the whole thing sounds like it belongs to specific communities and specific geographies rather than to a recording session. The music video plants both acts at a remote desert ranch, nothing designed, nothing constructed around them. The song already holds everything it needs. He has 1% left and he’s using it to tell her he’s sorry, and the music has been proving for three minutes that sorry isn’t going to fix it.
The messages are still on his phone. He never hit send.
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