This band American heavy metal band founded in September 1995 included what former bassist for the band Will Haven?
Slipknot (band): Slipknot is an American heavy metal band from Des Moines, Iowa. Slipknot (band):  The band was founded in September 1995 by percussionist Shawn Crahan and drummer Joey Jordison. Slipknot (band):  After several lineup changes in its early years, the band settled on nine members for more than a decade: Corey Taylor, Mick Thomson, Jim Root, Paul Gray, Craig Jones, Sid Wilson, Shawn Crahan, Chris Fehn and Joey Jordison.
i don't know