That's Good Enough for Me: Cookie Monsters of death-metal music.

To be a true Cookie Monster vocal, said Mr. Conner, who signed some of the subgenre’s biggest bands, including Sepultura and Fear Factory, “it’s got to be really, really guttural. It should sound like they’re gargling glass.” —Jim FusilliThat’s Good Enough for Me: Cookie Monsters of death-metal music.  (Opinion Journal)

New to me.