What Mayhem band member founded the one-man music project Burzum?
Mayhem (band):  Mayhem's early career was highly controversial, primarily due to their notorious live performances, the 1991 suicide of vocalist Per Yngve Ohlin ("Dead") and the 1993 murder of guitarist Øystein Aarseth ("Euronymous") by former member Varg Vikernes ("Count Grishnackh"), of Burzum. Varg Vikernes:  In 1991, he founded the one-man music project Burzum, which is considered one of the most influential black metal acts.
Varg Vikernes