Mayhem's lineup changed because of the murder of which founder of the early Norwegian black metal scene?
Euronymous Øystein Aarseth (] ; 22 March 1968 – 10 August 1993), who went by the pseudonym Euronymous, was a Norwegian guitarist. Euronymous was a founder of and central figure in the early Norwegian black metal scene. He was a co-founder of the Norwegian black metal band Mayhem. He was also founder and owner of the extreme metal record label Deathlike Silence Productions and record shop Helvete.
Per Bergersen Per Natrud Bergersen (1 October 1960 – 28 June 1990) was a musician from Røros, Norway. He was killed by a friend in 1990, when 29 years old, with a shotgun. According to news reports the friend said that he did this at Bergersen's request, as he wanted help committing suicide.