Universal Music Group and Sony Music sued Suno again, in the US District Court in Massachusetts. The 45 page complaint names 60,202 recordings. The argument is not that v6 was trained on their catalogue. It is that v6 was trained on the output of Suno's earlier models, which were. The labels call it the fruit of the same poisoned tree. Warner Music, BMG and Believe licensed content for v6. Universal and Sony did not. The filing follows a judge refusing to let them add the claim to the original case, now more than two years old.