AI music just hit the Billboard Hot 100. A track called Rubberz by Fenix Flexin, best known as a member of Shoreline Mafia, sits at number 58, and a growing pile of evidence says it was generated, not recorded.
The artist says otherwise. The labels are panicking. And nobody can actually prove it either way.
Why everyone thinks Rubberz is AI music
The suspicion started the moment the song dropped. Rubberz is a hard left turn from everything Fenix has released. It’s 80s UK synth pop with a Morrissey-influenced vocal melody and a fake British accent. Fans immediately started asking whether any of it was real.
Fenix posted that he recorded it the same way he records everything, blaming the difference on autotune, reverb, and a fake UK accent.
His producer, Purp On The Beat, has been cagier. He argued that artists should use AI like any other tool and that autotune is basically AI, without ever admitting the song was AI music.
Then producer Medasin posted a detailed breakdown claiming Rubberz is completely AI-generated. He says the track was made with software called Treblo, which used to be named Sonauto AI. Fenix himself apparently posted a snippet with Sonauto in the file name before the song came out.
Fenix responded with alleged Pro Tools project files on Instagram. Medasin called them fake, saying a stem separator was used to break the Treblo output into four tracks, with real vocals layered on top to make it look legitimate. Fenix deleted the post a few hours later.
The tells are in the audio
People who work in music hear it immediately. Charlie Harding, a songwriter and co-host of the Switched on Pop podcast, told The Verge the backing vocals ghost in and out unexpectedly and the drum reverb has the kind of digital artifacting you get from a low-bitrate MP3.
He said most generative AI companies trained their models on low-quality MP3s of unlicensed copyrighted material, and the degradation shows up in the finished track.
An AI music detector does not deliver a smoking gun. This is the part that makes the whole fight messy. The detectors flag it, but they can’t be certain either, and the song’s supporters point at that uncertainty like it’s proof of innocence.
The cover art is almost certainly AI too. Nobody credible is disputing that one.
The labels want AI music off the charts
The timing makes this a bigger story than one song. On Friday, Universal, Sony, and Warner, along with a bunch of indies, proposed new rules for chart eligibility. To make the charts, a song would have to be substantially human made.
Whatever that means.
That phrase is doing a lot of work. It’s a legal fig leaf for a problem nobody has solved: there’s no reliable way to tell a fully AI song from a human song with AI-assisted production.
Plenty of artists are already mixing both. The labels want a rule that defines the line, but the line moves every week.
This is also the second AI music story on this site in two days. I covered the German court ruling that hit Suno for training on unlicensed material, and now the same technology is sitting on the biggest chart in the US. The legal fight and the chart fight are the same fight.
What actually matters here
Forget Rubberz for a second. The real question is what happens when AI music is indistinguishable and artists won’t admit it’s there.
I don’t think AI music needs permission to exist. Tools like Suno and Udio are out there, people will use them, and some of that output is genuinely good. The problem is disclosure. If a song on the Hot 100 was made with AI, the audience deserves to know, the same way food labels list ingredients.
Fenix has every reason to deny it. Acknowledging the song is AI music would kill its chart run, and the industry has already proven it punishes artists for admitting it. His denials look exactly like what a guilty artist would say, but they also look like what an innocent artist with a controversial sound would say. That’s the trap.
The labels’ new rule won’t fix this. It will just move the fight to legal definitions nobody agrees on, and the songs will keep coming. The music industry spent decades fighting file sharing and streaming. It’s about to spend a decade fighting a fight it can’t win, because you can’t un-generate a song.
The one honest fix is disclosure, and it has to be the artist’s job. Until then, assume the chart has AI music on it. It already does, and the people who made it aren’t talking.
