Koen Holtkamp has released two solo albums as AERO and two albums as Mountains, a duo project with Brendon Anderegg. He has toured throughout the US and Europe performing everywhere from festivals, art galleries, and museums to basements, hippie communes, churches, and rock clubs. Holtkamp has performed with Fennesz, Tony Conrad, Greg Davis, Minamo, Tape, Nicholas Collins, Carsten Nicolai, Lichens, Supersilent, Alog, etc.

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