Kjartan Sveinsson
Kjartan Kjarri Sveinsson is former keyboardist for the Icelandic postrock band Sigur Rs. He joined the band in 1998. A multiinstrumentalist, he has also played such instruments as the flute, tin whistle, oboe, guitar and even the banjo, as well as many of the unorthodox instruments that contribute to Sigur Rss distinctive sound.
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Source: Wikipedia