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.

Question: What are some of Euronymous' beliefs about black metal?
Self-contained rewrite: What are some of Euronymous' beliefs about black metal?