In winter, when you get off the train at Warschauer Strasse, a station in the famous Berlin district of Friedrichshain, you often see a busker drumming on the street in the bitter cold. Little does he know that just a short walking distance away lies the incredible success story and the flat of Oliver Koletzki, the German DJ and producer whose track 'Der Mückenschwarm' was picked up by Sven Vath's Cocoon Records in 2005.