Jon Øyvind Andersen, mostly known as Jardar, is a Norwegian

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

 black metal

Black metal

Black metal is an extreme subgenre of heavy metal music. Common traits include fast tempos, shrieked vocals, highly distorted guitars played with tremolo picking, blast beat drumming, raw recording, and unconventional song structure....

 guitarist

Guitarist

A guitarist is a musician who plays the guitar. Guitarists may play a variety of instruments such as classical guitars, acoustic guitars, electric guitars, and bass guitars. Some guitarists accompany themselves on the guitar while singing.- Versatility :The guitarist controls an extremely...

. He was one of the founding members of the band Old Man's Child

Old Man's Child

Old Man's Child is a black metal band from Norway. The band is the brainchild of Galder who is the only permanent member of the band now.-Formation:...

, with Galder

Galder

Galder is a Norwegian composer, guitarist, and vocalist whose birth name is Tom Rune Andersen. He is from the small town Jessheim, north of Oslo. He is a founding member of the melodic black metal band Old Man's Child as well as the lead guitarist in Dimmu Borgir. In 1993, under the stage name...

 and Tjodalv

Tjodalv

Tjodalv is a Norwegian drummer. He is a founding member of both Dimmu Borgir and Old Man's Child. He now plays in Black Comedy and Susperia. Tjodalv played guitar on the first Dimmu Borgir albums Inn I Evighetens Mørke and For All Tid. He then switched to drumming for them on Stormblåst and...

. He has played on all the bands albums, except Ill-Natured Spiritual Invasion

Ill-Natured Spiritual Invasion

Ill-Natured Spiritual Invasion is the third studio album by Norwegian black metal band Old Man's Child. Most of the lyrics were improvised by Galder while in the studio.- Track listing :All music, lyrics and arrangements by Galder....

(1998) , Vermin

Vermin (album)

Vermin is the sixth studio album by Norwegian black metal band Old Man's Child, released on October 14, 2005.-Track listing:All music and lyrics written and composed by Galder, except "Twilight Damnation" ....

(2005) and Slaves of the World

Slaves of the World

Slaves of the World is the seventh studio album by Norwegian black metal band Old Man's Child. The album was released May 18 in Europe and May 19 in North America via Century Media Records. The album was recorded in the fall of 2008 at Studio Fredman in Gothenburg, Sweden, with producer Fredrik...

(2009)
, where Galder was the sole guitarist. Besides as a guitarist, Jardar has also contributed with backing vocals, and he was also co-writer on two songs on In Defiance of Existence.

In 2005 he formed the band Insidious Disease, together with Silenoz

Silenoz

Silenoz , is a Norwegian guitarist who is a founding member, along with Shagrath and Tjodalv, of the Norwegian symphonic black metal band Dimmu Borgir which he is the primary songwriter...

, the Dimmu Borgir

Dimmu Borgir

Dimmu Borgir is a Norwegian black metal band from Oslo, Norway, formed in 1993. Dimmu borgir means "dark cities" or "dark castles/fortresses" in Icelandic, Faroese and Old Norse. The name is derived from a volcanic formation in Iceland, Dimmuborgir...

 guitarist, singer Marc Grewe of Morgoth

Morgoth

Morgoth Bauglir is a fictional character from J. R. R. Tolkien’s Middle-earth legendarium. He is the main antagonist of The Silmarillion, figures in The Children of Húrin, and is mentioned briefly in The Lord of the Rings.Melkor was the most powerful of the Ainur, but turned to darkness and became...

, the bass player Shane Embury

Shane Embury

Shane Embury is a British bassist and member of Napalm Death.-Napalm Death:Embury is the only member left who has been in the band since the Scum tour, replacing previous bassist Jim Whitley in 1987...

 from Napalm Death

Napalm Death

Napalm Death are a death metal band formed in Birmingham, England in 1981. While none of its original members remain in the group, the lineup of vocalist Mark "Barney" Greenway, bassist Shane Embury, guitarist Mitch Harris and drummer Danny Herrera has remained consistent for most of the band's ...

 and drummer Tony Laureano

Tony Laureano

Tony Laureano is a heavy metal drummer originally from Puerto Rico. He has been playing for a number of metal bands including Dimmu Borgir, Nile, Angelcorpse, Malevolent Creation, God Dethroned, Acheron, Aurora Borealis, Belphegor, Nachtmystium, 1349 and Brujeria...

.

With Old Man's Child

• In The Shades Of Life, Hot Records, 1994,
• Born of the Flickering
  Born of the Flickering
  Born of the Flickering is the debut album by Norwegian black metal band Old Man's Child. It was first released in 1995 by Hot Records and re-released in 1996 by Century Media with different artwork.-Track listing:#"Demons of the Thorncastle" – 4:47...
  
  , Hot Records, 1995
• The Pagan Prosperity
  The Pagan Prosperity
  The Pagan Prosperity is the second album by black metal band Old Man's Child, released on the 7th October 1997. It was recorded and mixed at Studiomega in June 1997.-Track listing:All music, lyrics and arrangements by Galder.#"The Millennium King" – 5:28...
  
  , Century Media, 1997
• Revelation 666 - The Curse of Damnation
  Revelation 666 - The Curse of Damnation
  Revelation 666: the Curse of Damnation is the fourth studio album by Norwegian black metal band Old Man's Child, released on March 13, 2000.- Track listing :All music and arrangements by Galder...
  
  , Century Media, 2000
• In Defiance of Existence
  In Defiance of Existence
  In Defiance of Existence is the fifth studio album by Norwegian black metal band Old Man's Child, released on January 20, 2003.- Track listing :All music and lyrics written and composed by Galder, except on tracks 4 & 7 music by Galder/Jardar....
  
  , Century Media, 2003