 Complete the following phrase:  At the age of 14, he was discovered by Rolf Brendel, formerly the drummer for Nena. In 2002, his second single, Lieber Gott, made in collaboration with Peter Maffay, Nena, Udo Lindenberg, Herbert Dreilich, Joachim Witt and Rolf Stahlhofen, was a breakthrough, reaching No.6 on the German charts. Revenue from the song was used to help victims of the 