THE SIMPSONS has offered an apology to JUDAS PRIEST. In a recent episode, they referred to JP as "death metal". Um, DUH! Everyone knows Judas Priest isn't Death Metal, it's New Wave British Metall!!! Next you'll try to tell me that Megadeth is Speed Metal and not Thrash Metal!!! Kids these days.
If you'd like a good primer on the many (MANY) subgenres of metal, I recommend this article from AV Club.