"The marriage of jazz—in all its incarnations—and metal may sound at first as a sacrilegious act but not for a creative musician in the vibrant Norwegian music scene. Norwegian metal bands defined the black metal sub-genre in the eighties and nineties. Moreover, the young generation of Norwegian jazz-trained musicians ignore the American strictly codified version of jazz and have interpreted this music as an open, inclusive one. So why bother with theoretical arguments about clearly defined musical genres and not simply enjoy the music..."
Read more at allaboutjazz.com