Walter Hagen-Groll

Walter Hagen-Groll was a German choral conductor, conductor and pianist. He was known as chorus director for decades at the Deutsche Oper Berlin and the Salzburg Festival. He was professor at the Mozarteum in Salzburg. From Wikipedia (https://en.wikipedia.org/wiki/Walter_...) under Creative Commons Attribution CC-BY-SA 3.0 (http://creativecommons.org/licenses/b...)