Burzum is just one dude. He is an interesting dude though.

clicky.

Some Burzum stuff has been accused of being racist but I just can't see it. Though Varg has done some racist writings comparing different races brains to different computer processors.

The album "Aske" (means "ashes" I think) is great and I suggest you check it out.

Free, if black metal interests you check out a book called "Lords of Chaos".

click

It appears to be out of print at the moment but it's not so obscure that you wouldn't be able to get a copy. Your local library might even have it.