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Slipknot is an American heavy metal band from Des Moines, Iowa. Formed in 1995, the group was founded by percussionist Shawn Crahan and bassist Paul Gray. After several lineup changes in their early days, the band consisted of nine members for the greater part of their tenure: Sid Wilson, Paul Gray, Joey Jordison, Chris Fehn, Jim Root, Craig Jones, Shawn Crahan, Mick Thomson, and Corey Taylor. However, the death of Paul Gray on May 24, 2010, left the band with only eight remaining members. Former guitarist Donnie Steele was the band's touring bassist in 2011.
Slipknot is well known for its attention-grabbing image, aggressive music style, and energetic and chaotic live shows. The band had somewhat of a meteoric rise to success following the release of their self-titled debut album in 1999. The 2001 follow-up album Iowa further increased the band's popularity. After breaking for their first hiatus, Slipknot returned in 2004 with Vol. 3: (The Subliminal Verses) and once again in 2008 with their fourth album All Hope Is Gone, which debuted at the top spot on the Billboard 200. Additionally, the band has released one live album, 9.0: Live, one compilation album, Antennas to Hell, as well as four live DVDs.

http://en.wikipedia.org/wiki/Slipknot_(band)