Who knows 3 hidden metal subgenres?

There is a band from Denmark called Volbeat, and they were dubbed Elvis Metal b/c they combined 50s rock and metal and suprisingly it is awsome. There is Christian Black Metal(got love the irony in that) which from what I have heard of is referred to as white metal for bands like Demon Hunter that you mentioned. When Fear Factory came out way back when they were the first to be dubbed Indutrial death metal. A band from England called Inkubus Sukubus has been referred to as Celtic Metal.