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Sony Music and Universal Music Group have filed another lawsuit against Suno, alleging that the company's new v6 model still infringes their copyrights because it was trained on user outputs from earlier Suno models, which were themselves trained on unlicensed music scraped from YouTube and other sources. Sony and UMG are among the labels that never signed a licensing agreement with Suno. The suit deepens ongoing legal battles between major record labels and AI music-generation companies over training data and copyright, as courts continue to grapple with how copyright law applies to AI-generated content.