He is best known as the former vocalist in the black metal band Mayhem under the stage name Maniac .
Sven Erik Kristiansen ( born 4 February 1969 ) is a Norwegian musician .
Sven Erik Kristiansen is best known as the former vocalist in the black metal band Mayhem under the musician   musician .
Sven Erik Kristiansen ( born 4 February 1969 ) is a Norwegian musician .