Jamendo sues Suno, claiming its Bark model trained on 919 hours of Jamendo music

Winamp Group’s music licensing subsidiary Jamendo sued Suno in Massachusetts federal court on June 29, 2026. The complaint says Suno trained on the MTG-Jamendo research dataset without a license, including roughly 919 hours of Jamendo audio inside Bark, Suno’s early open-source audio model. It is Jamendo’s second AI training lawsuit in a week.

What Jamendo’s complaint against Suno claims

The complaint brings 4 sets of claims: copyright infringement under the US Copyright Act, breach of contract, unjust enrichment, and unfair and deceptive business practices under Massachusetts law. Jamendo says Suno “blatantly disregarded” its intellectual property rights and seeks an injunction plus actual damages and Suno’s profits.

The filing leans on Suno’s own words. It quotes the company’s public stance about “extreme speed” and its embrace of the line “impatience is a virtue” as evidence the infringement was willful. The US Copyright Office issued a registration for the dataset on June 17, 2026, less than 2 weeks before the suit, as Music Business Worldwide reported.

The MTG-Jamendo dataset keeps generating lawsuits

The MTG-Jamendo dataset is a research collection of more than 55,000 tracks Jamendo built around 2019 with the Music Technology Group at Universitat Pompeu Fabra in Barcelona. It was released for non-commercial research only. Commercial use requires a paid license from Jamendo.

A week before this filing, Jamendo sued Nvidia over the same dataset, alleging its Fugatto and Audio Flamingo models trained on it. The Suno case adds a twist the Nvidia case lacks: a paper trail. Jamendo invoiced Suno for the unauthorized use on September 29, 2025. Suno confirmed receipt by October 3 and did not pay. Jamendo’s Belgian counsel sent a formal notice of default on October 14.

Where the Jamendo case lands in Suno’s copyright docket

The suit joins a crowded calendar. Universal and Sony are litigating against Suno in the same federal district and want to expand their case to 61,026 recordings, a move covered in the RIAA v. Suno tracker. Germany’s GEMA is pressing a separate composition-focused case, and Denmark’s Koda filed its own suit in June.

Warner Music took the other exit and settled in November 2025 with a licensing deal. Every new plaintiff makes the unresolved question louder: what does AI training on unlicensed music cost? Jamendo, unusually, already named its price. It sent an invoice.