An investigation published by The Atlantic, led by reporter Alex Reisner, found that four publicly circulating music datasets together contain roughly 21.2 million copyrighted recordings. Per The Atlantic, the largest collections are LAION-DISCO-12M (about 12.6 million tracks) and Sleeping-DISCO-9M (about 9 million tracks), with two smaller datasets including the Free Music Archive (around 100,000 tracks). The Atlantic also launched a free searchable tool, the AI Watchdog, that lets artists check whether their work appears in the collections. Reporting by DJ Mag and MusicTech notes that Google and Stability AI were identified as having drawn on the Free Music Archive dataset. The investigation highlights questions about consent, licensing, and how large-scale scraping is being used in generative audio development.