Claim: Grayskul is an American hip hop duo based in Seattle and was formed in 2003.
Evidence: Grayskul is an American hip hop duo based in Seattle, Washington, consisting of rappers Onry Ozzborn and JFK Ninjaface. Since its formation in 2003, the group has released ten solo albums. 
Seattle, Washington, U.S. 2003–present JFK Ninjaface
Onry Ozzborn