A massive AI music dataset, Sleeping-DISCO-9M, comprising just over 9.7 million tracks scraped from commercial music, was taken down by its publisher, the Sleeping AI Research Collective, amid fallout from an investigation by The Atlantic into four publicly circulating datasets that together contained roughly 21.2 million copyrighted recordings. The investigation included a free tool allowing artists to check if their songs appeared in the collections, leading to dismay among artists whose music was found. The only confirmed users of the datasets are Google and Stability AI, which cited the Free Music Archive, the smallest of the four collections, in published research papers. A paper accompanying Sleeping-DISCO-9M, titled "SLEEPING-DISCO 9M: A Large-Scale Pre-Training Dataset for Generative Music Modeling," was also quietly withdrawn. Sleeping AI issued a statement saying the "absolute erasure" was a deliberate decision by the team "in response to eme."