Berlin loses thousands of city trees every year. "Friends of the Earth Germany" aims to stop this trend. Our idea: a one of a kind charity concert - with a chestnut tree as the musician. For him we built a unique instrument: each impact of a falling chestnut produced an artistic composition of sound and light. So the tree could play for his companions and collect donations. “Tree Concert“ gained massive media coverage and lead to a new donation record for the preservation of trees.