Conversation so far:
What is black metal?
Black metal is an extreme subgenre of heavy metal music. Common traits include fast tempos, a shrieking vocal style, heavily distorted guitars played with tremolo picking, raw recording, and more.
What is the music genre death metal?
Death metal is an extreme subgenre of heavy metal music. It typically employs heavily distorted and low-tuned guitars, played with techniques such as palm muting and tremolo picking.
What are some of Euronymous' beliefs about black metal?
Euronymous said that the term black metal can apply to any kind of metal so long as it is Satanic and heavy.

Question: What were some of Euronymous' beliefs about death metal?
Self-contained rewrite: What were some of Euronymous' beliefs about death metal?