Question: Det som engang var (Norwegian for "what once was") is the second studio album by the Norwegian black metal solo project Burzum, a music project that began in 1991, by which Norwegian musician and writer?
Sentence (from "Burzum"): Burzum ( ; ] ) is a music project that began in 1991 by the Norwegian musician and writer Varg Vikernes.
Relevant evidence: Yes