Conversation so far:
What is black metal?
black metal can apply to any kind of metal, so long as it is "Satanic" and "heavy".
What is death metal?
death metal can apply to any kind of metal, so long as the band "cultivates and worships death".

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