Question: The Forest is my Throne/Yggdrasill is by Satyricon and a Norwegian extreme metal band formed by Ivar Bjornson and who?
Context: In Times is the thirteenth studio album by the Norwegian extreme metal band Enslaved.  It was released on March 10, 2015 by Nuclear Blast.  As the title suggests, the album's central theme is that of time, considered philosophically, historically, and mythologically.  The album sold about 2,950 copies in its first week of release in the United States, making "In Times" their highest sales debut to date.  The album charted in some territories in its first week of release, including Norway and Finland.  It is also the band's last album with keyboardist/vocalist Herbrand Larsen, who departed the following year. Reptilian is the fifth studio album by the Norwegian extreme metal band Keep of Kalessin, released on 10 May 2010 in Europe and on 8 June 2010 in North America through Nuclear Blast.  The album peaked at number two on the Norwegian record chart, "VG-lista".  This would be the last album with Torbjørn "Thebon" Schei on vocals before being fired in 2013. RIITIIR, occasionally typeset as "RIITIIЯ," is the twelfth studio album from the Norwegian extreme metal band Enslaved.  It was released on September 28, 2012 in Europe and on October 9, 2012 in North America.  The name RIITIIR is Ivar Bjørnson's "Norse-ified" take on the words "Rites/Rituals", or "The Rites of Man", and rituals form the central concept of the album.  The album received positive reviews from music critics, and sold around 2,300 copies in its first week of release in the United States, which made it their highest debuting album to date in terms of sales. Satyricon is a Norwegian black metal band, formed in 1991 in Oslo.  Satyr and Frost have been the band's core members since 1993.  The band's first three albums typify the Norwegian black metal style.  Since its fourth album in 1999, the band has strayed from this style and included elements of traditional heavy metal in their sound.  Satyricon was the first Norwegian black metal band to join a multi-national record label (EMI). Discipline is the third album by the Norwegian death metal band Cadaver, but was released under the moniker Cadaver Inc.  It is particularly notable for the vocal contributions of two Norwegian extreme metal figures - Bard "Faust" Eithun (ex-Emperor) and Fenriz (Darkthrone).  Design and Illustration were by Justin Bartlett. The Wanderer and His Shadow is the second full-length album from Norwegian extreme metal band, Pantheon I and was released in May 2007. Enslaved is a Norwegian extreme metal band formed by Ivar Bjørnson and Grutle Kjellson in Haugesund in June 1991.  They are currently based in Bergen, Norway.  Though the band's lineup has changed many times over the years, Bjørnson and Kjellson have been the sole constant members, and the lineup remained the same from 2004 to 2016.  Following their 25th anniversary world tour, keyboardist/guitarist/vocalist Herbrand Larsen departed from the band after 12 years and six albums.  He has since been replaced by Håkon Vinje. Dødheimsgard (also known as DHG) is a Norwegian extreme metal band formed in 1994.  Dødheimsgard was originally a black metal band, but 1999's "666 International" saw them change into an experimental and avant-garde / industrial metal band.  In 2000, they shortened their name to DHG. Introspection is the second extended play by the Norwegian extreme metal band Keep of Kalessin, released on 9 April 2013 in Norway.  The EP contains two new songs, as well as a re-done "extreme version" of their song "The Dragontower". The Forest Is My Throne/Yggdrasill is a split album by Satyricon and Enslaved.
Answer: Grutle Kjellson