Skip to Content

How San Francisco gave ‘Rubberz’ its bounce

The rising indie label Empire and a tiny AI music startup helped Fenix Flexin become the summer’s biggest slop star

12:49 PM PDT on August 5, 2026

The music video for Fenix Flexin’s ‘Rubberz,’ our slop song of the summer. Photo: Screenshot/YouTube

It is all but confirmed that “Rubberz,” the Billboard Hot 100-charting song by Los Angeles rapper  Fenix Flexin, was generated using AI. Inspired by music producer Medasin’s Instagram takedown of the song from last week, music writers and YouTubers are making their cases for why this bit of Human League-meets-Drake circa “Hotline Bling” was likely prompted rather than produced. 

Flexin claims to have produced the song manually, going so far as to show off production stems, but for our purposes, it’s worth noting that “Rubberz” would never have a chance to drill into your ear without San Francisco. 

Flexin, a member of the West Coast rap crew Shoreline Mafia, released “Rubberz” in June through San Francisco indie label Empire, whose massive headquarters sits at 1 Montgomery St. After catching traction (and suspicion) online, Medasin’s Instagram video claimed that “Rubberz” was created using a tiny SF-based AI free AI-service called Treblo that currently employs four people. Treblo’s website boasts “Turn any idea into a full song.”

In a statement to Gazetteer, Treblo co-founder Ryan Tremblay said that the track was likely entirely generated using this service. 

“Someone appears to have used our model to find a sound that millions of people connected with and that's exciting,” he said in an emailed statement Wednesday.

Flexin vehemently denies any use of AI, but given the evidence and the uncanny valley feel of “Rubberz,” it seems the rapper doth protest too much. 

Empire, the increasingly influential label that Flexin is signed to, has remained mum on the whole thing. (A representative for the label has yet to get back to us.) 

Judging from comments he’s made in the past, Empire CEO Ghazi Shami probably doesn’t have any qualms. In a January interview with the private equity firm Sixth Street, Shami sounded excited about generative AI burrowing its way into the music industry.

“I’m trying to say this in the most constructive way possible, if you’re not using AI in some way, shape, or form in the music business, you’re going to be at a severe competitive disadvantage,” he told Sixth Street co-president David Stiepleman.

Thanks for reading! If you liked this article, share it with someone. That’s the best way for new readers to discover Gazetteer SF.

Stay in touch

Sign up for our free newsletter

More Stories

Fire season brings dangerous risks to wedding season

Northern California wedding venues and their guests hope for the perfect day while dealing with some very imperfect conditions

August 4, 2026

A parody Connie Chan chatbot is Scott Wiener’s newest tactic

ConnieChan.AI employs Anthropic’s tech for a novel interactive attack ad, but all Chan’s campaign sees is desperation

August 4, 2026

The new AI billboard locals actually like

Plus, OpenAI did a brand trip for influencers

August 3, 2026

Jollibee Watch: All (well, most) has been revealed

A Jollibee exec answers some of our pressing questions

July 31, 2026

Drinking Companion: Fool’s Errand is the wise choice

If you can take some noise and don’t mind the first dates, this buzzy NoPa wine bar is perfect for after-work plots 

July 31, 2026