Universal and Sony ask to add 61,000 recordings to their Suno case after searching its training data

Universal Music Group and Sony Music Entertainment have asked the federal court in Massachusetts to let them expand their copyright case against Suno from 560 recordings to more than 61,000. The motion, filed on 21 May, says discovery showed the AI music company trained on millions of the labels' tracks, and that the new list is only a representative slice. Judge F. Dennis Saylor IV must approve the change, and Suno opposes it.

The labels found their recordings by running Suno's training files through Audible Magic's content-recognition system. Their experts spent two weeks in a secure room at the office of Suno's lawyers creating fingerprints, which were then sent off for matching. Getting there took most of a year: Suno agreed to the process in June 2025, withdrew in July over security concerns, and only settled terms in October after a magistrate judge pushed for a compromise. Results arrived in January 2026, followed by manual checks at each label on registrations and ownership.

Suno argues that so many new works would in effect restart the case and delay a ruling on its fair use defence. The labels say any delay is Suno's own doing for refusing to disclose its training data, and propose deciding fair use on summary judgment before ownership questions on the new works are settled. They also stress that the amendment adds works to an existing claim rather than a new theory. The proposed complaint repeats an earlier, still pending allegation that Suno stream-ripped music from YouTube.

The case dates from June 2024. Warner Music was a co-plaintiff but settled and licensed its catalogue to Suno in November 2025, leaving Universal and Sony, whose own talks with the company have reportedly stalled. A magistrate judge has refused the two labels access to the Warner deal's terms, a ruling they are contesting.

Dispositive motions are due by 8 January 2027, a date that may move if the amendment is allowed. A day after the Suno filing, Sony made a parallel request in its Udio case to add a further 30,442 works found the same way.