"American progressive metal musical groups" . "Musical groups from Los Angeles" . "American avant-garde metal musical groups" . "Grammy Award winners" . "American post-metal musical groups" . "Tool (band)" . "Zoo Entertainment (record label) artists" . "Musical quartets" . "Volcano Entertainment artists" . "Art rock musical groups" . "Musical groups established in 1990" . "Progressive rock musical groups from California" . "Heavy metal musical groups from California" . "American alternative metal musical groups" .