Kjartan "Kjarri" Sveinsson (born 2 January 1978) is a keyboardist of the Icelandic post-rock band Sigur R├│s. He joined the band in 1998. Being something of a multi-instrumentalist, he has also played such instruments as the flute, tin whistle, oboe and even the banjo, as well as many of the unorthodox instruments that contribute to Sigur R├│s's distinctive sound. He also plays the guitar. Kjartan has performed under the pseudonym "The Lonesome Traveller" with Sigur R├│s band-mate Orri P├íll D├¢rason and Amiina violinist Mar├¡a Huld Markan Sigf├║sd├│ttir (whom Kjartan married in 2001). "The Lonesome Traveller" covered Sigur R├│s songs acoustically in an alt-country style. Kjartan also composed the score for the 2005 Academy Award nominated short film S├¡├░asti b├ªrinn (The Last Farm), for award winning director Ramin Bahrani's 2009 short film Plastic Bag which features the narration of legendary filmmaker Werner Herzog, and for the 2009 film Ondine directed by Neil Jordan. Kjartan also contributes to Sigur R├│s'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.