Sven Erik Kristiansen is a Norwegian musician. He is best known as the former vocalist in the black metal band Mayhem under the stage name Maniac. He joined the band in 1986 after the departure of the bands original vocalist Messiah (Eirik Nordheim). He was in the band until his departure in 1988. He was replaced by Dead (Per Yngve Ohlin). Black metal is a musical genre which emerged in the early 1980s predating the great expansion of heavy metal extreme genres. ... Mayhem is a Norwegian black metal band which was originally formed in 1983. ... Per Yngve Ohlin (January 16, 1969 – April 8, 1991) was a vocalist for Mayhem, a Norwegian black metal group, who went by the stage name Dead. ...

When Hellhammer (Jan Axel Blomberg) decided to revive Mayhem in 1995 after the deaths of both Euronymous (Øystein Aarseth) and Dead, he invited Maniac to return as the band's vocalist. Jan Axel von Blomberg, also known by his stage name Hellhammer, is a black and avantgarde metal drummer from Oslo, Norway. ... Øystein Aarseth (March 22, 1968–August 10, 1993) was a guitarist for the infamous Norwegian black metal band Mayhem who went by the stage name Euronymous. ...

Maniac was in the band until 2004 when he was forced to leave. He suffered from acute stage fright and alcohol problems. Stage fright refers to an anxiety, fear or persistent phobia related to performance in front of an audience. ... In chemistry, an alcohol is any organic compound in which a hydroxyl group (-OH) is bound to a carbon atom of an alkyl or substituted alkyl group. ...

He is now a member of the hardcore punk band Bomberos. Hardcore punk (or hardcore) is a faster and heavier version of punk rock usually characterized by short, loud, and often passionate songs with exceptionally fast tempos and chord changes. ... Bomberos, a Norwegian based group, playing what they like to call obscene, disgusting punk, was formed in 2002. ...

References

• Maniac info at Mayhem's Official website