Kjetil-Vidar Haraldstad (stage name Frost), was born on June 28, 1973 in Øyer, Oppland, Norway, and is the drummer in the black metal bands Satyricon and 1349.
Frost has previously performed with Gorgoroth, Zyklon-B, Gehenna and Keep Of Kalessin. He originally joined Satyricon temporarily to record the demo "The Forest is My Throne", later joining the band full-time. He currently studies at a mathematics college in Oslo.
Frost employs various drumming styles when performing with different bands. With early 1349 and early Satyricon he extensively uses blast beats. His recent work with Satyricon is more simplistic and mid-tempo, as is his work on "Revelations of the Black Flame", 1349's fourth album. On 1349's fifth album "Demonoir", however, Frost once again makes extensive use of blastbeats. He is generally regarded as one of the most proficient and fastest drummers in the black metal scene. On all Satyricon albums his role is credited simply as "battery".
Frost was denied entry to North America by the US Department of Homeland Security upon failing to note having been sentenced to 5 months for assault (during a bar fight in the early '90s) when applying for his work visa. On 1349 tours before 2008, he was replaced by Tony Laureano. Joey Jordison and Trym Torson have performed with Satyricon on North American tour dates. He later was able to perform again in the United States.