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.
Havoc Unit Havoc Unit, formerly known as ...and Oceans, is an industrial black metal band from Finland. It was formed in 1989 as a death metal outfit called Festerday, but soon changed its style to symphonic black metal. It released its first album as ...and Oceans in 1998, and in the following years it pursued a less traditional, more industrial-oriented direction. After ten years of existence as ...and Oceans and four full-length albums, the band changed its name to Havoc Unit in 2005. Its first album under the new name was "h.IV+ (Hoarse Industrial Viremia)", released in 2008. After five years, in 2013 band's name has returned to be Festerday.