Both Dødheimsgard and Avant-garde metal are both examples of what?
Dødheimsgard Dødheimsgard (also known as DHG) is a Norwegian extreme metal band formed in 1994. Dødheimsgard was originally a black metal band, but 1999's "666 International" saw them change into an experimental and avant-garde / industrial metal band. In 2000, they shortened their name to DHG.
Dunderbeist Dunderbeist (Sort of Norwegian for "Noisy Beast") is a heavy metal band from Hedmark, Norway. The band was formed by former members of Krace, KITE and Stonegard. Dunderbeist has been recording since 2008 with several albums and extensive touring. The Norwegian six-piece band now releases material outside of Norway following their first international effort “Black Arts & Crooked Tails”.