Moebius and Roedelius reunited for a performance at the Kosmische Club in Camden, London on April 15, 2007. They also performed at the opening of documenta 12 on June 15, 2007 in Kassel, Germany and the fourth annual More Ohr Less festival in Lunz, Austria on August 10, 2007. From September to November, 2007 Cluster had additional concert performances in Germany, Switzerland, Norway, Estonia, and the Netherlands. Roedelius also gave a solo concert performance in Ojai, California in the United States. Moebius and Roedelius have also reunited with Michael Rother and the first Harmonia concert in more than 30 years took place in Berlin on November 27, 2007. They performed at the opening of documenta 12, a major exhibition of modern and contemporary art held every five years in Kassel, Germany on June 15, 2007.