Records catalog, all of Decca's masters from the 1930s to the 1950s, most of the original Chess masters, which included artists such as Chuck Berry, Muddy Waters, and Howlin' Wolf, as well as most of John Coltrane's master tapes from his period signed to Impulse! Records. On Twitter, Rosen stated that the Coltrane masters were among the most checked-out Impulse! items in the vault, and a source had told him that the masters for A Love Supreme were likely elsewhere during the fire. Two weeks later, Rosen wrote a follow-up article, listing at least 700 additional artists named in internal UMG documents as possibly affected. Determining which recordings had been destroyed, or how much of an artist's discography had been affected, was impossible, he wrote. For example, Rosen said it was difficult to confirm whether the Neil Young recordings listed in the documents were the original master tapes of the albums he recorded for Geffen Records in the 1980s, or session outtakes from those records. Rosen tweeted that the documents also listed several Broadway cast recordings among the tapes destroyed. Additionally, several nonmusical audio recordings were reported as destroyed, including the original recording of Martin Luther King Jr.'s 1968 "Remaining Awake During a Great Revolution" sermon delivered at the Washington National Cathedral. Despite Rosen's reporting, at the end of the second article, even The New York Times acknowledged they could not definitely state that any master recordings had actually been lost in the fire, stating "It is not possible to assert definitively which masters were burned in the fire, nor can it be said categorically that all of these artists did in fact lose masters. It also cannot be determined exactly how many of the destroyed masters were primary-source originals." Artists' responses Bryan Adams, Semisonic drummer Jacob Slichter, and Counting Crows singer Adam Duritz said they had been told that UMG had misplaced their tapes. Richard Carpenter told the Times he had been informed about the destruction of his tapes by a UMG employee while he was working on a reissue, and only after Carpenter had made multiple, persistent inquiries. Following the publication of Rosen's articles, several affected musicians posted reactions on social media, with some noting specific tapes that may have been lost. For instance, singer-songwriter Jill Sobule said she had lost two masters in the fire, including tapes for an unreleased album produced by Joe Jackson, but Sobule