1) American hip hop group 
Grayskul is an alternative hip hop group from Seattle, Washington. ==History== In 2003, Onry Ozzborn and JFK, both members of the Pacific Northwest hip hop collective Oldominion, teamed up with bassist Rob Castro to form Grayskul. They recorded about 55 songs in 8 months at ATB Studios; these would eventually become the albums Creature, Thee Adven...