Kristoffer Rygg

In 2009, fifteen years after their only concert back in 1993, he decided to reintroduce Ulver live in concert. The first show was hosted by the Lillehammer Norwegian Literature Festival Norwegian Festival of Literature, and initiated by the late author Stig Sæterbakken. A year later, and after a series of shows around Europe, Rygg stood in front of a full house at the main stage of Oslo's National Opera & Ballet. A DVD/Blu-ray from the event was released commercially, and includes liner notes by Rygg and Sæterbakken.

In recent years Rygg has been involved in freeform/improvisational project Æthenor which includes notable musicians such as Stephen O'Malley of Sunn O))), Daniel O'Sullivan of Guapo and David Tibet of Current 93. In April 2008 he played five concerts with Æthenor. It was his first time on stage in over a decade. Rygg has since participated in several mini-tours and concerts with Æthenor. Their triple residency at the Oslo jazz club Blå resulted in the much-acclaimed 4th album En Form for Blå.

In 2005, Rygg collaborated with Portuguese musician/producer Daniel Cardoso in the project Head Control System. The music was described by the label as "groovy rock/metal with progressive edges and cinematic components." Their first and only full-length, entitled Murder Nature was released on 4 April 2006 through The End Records.

In addition, he was vocalist for Borknagar (1995–1997) and Arcturus (1993–2003), both of which comprise many eminent musicians from the early Norwegian black metal scene. Rygg was responsible for introducing Borknagar to the singer who replaced him, ICS Vortex, when he resigned from the band.

Kristoffer Rygg (9 September 1976), also known as Garm, Trickster G. Rex and recently God Head, is a heavy-metal vocalist, musician and producer known primarily for his work with Ulver and Arcturus.