Slipknotās fourth studio album, All Hope Is Gone , released on August 20, 2008, represents a pivotal and polarizing era for the band. While it became their first record to debut at number one on the Billboard 200, it also highlighted a period of deep internal friction and a significant shift in their sonic identity.
The album marked a clear departure from the raw nu-metal roots of their self-titled debut and Iowa . Instead, Slipknot embraced a more "polished" groove metal style, incorporating elements of thrash and death metal.