Kjartan "Kjarri" Sveinsson (Icelandic pronunciation: ​[ˈcʰar̥tan ˈsveinsɔn]; born 2 January 1978) is the keyboardist for the Icelandic post-rock band Sigur Rós. He joined the band in 1998. A multi-instrumentalist, he has also played such instruments as the flute, tin whistle, oboe, guitar and the banjo, as well as many of the unorthodox instruments that contribute to Sigur Rós's distinctive sound.
Kjartan has performed under the pseudonym "The Lonesome Traveller" with Sigur Rós bandmate Orri Páll Dýrason and Amiina violinist María Huld Markan Sigfúsdóttir (whom Kjartan married in 2001). "The Lonesome Traveller" covered Sigur Rós songs acoustically in an alt-country style.
Kjartan also composed scores for the 2005 Academy Award nominated short film Síðasti bærinn (The Last Farm) by Rúnar Rúnarsson, for award-winning director Ramin Bahrani's 2009 short film Plastic Bag which features the narration of filmmaker Werner Herzog, and for the 2009 film Ondine directed by Neil Jordan. Kjartan was the composer on Volcano (2011) and Sparrow (2015) both directed by Rúnar Rúnarsson. Kjartan also contributes to Sigur Rós's orchestral and string arrangements, along with the group Amiina. He is also featured heavily on The Album Leaf's album, In a Safe Place, playing a wide variety of instruments.

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