Countertenor Jochen Kowalski has announced his retirement at the age of 68. In a statement Staatsoper Unter den Linden said,  “the career of Berlin Kammersänger Jochen Kowalski began at the Komische Oper Berlin. His roles, many in productions by Harry Kupfer, made him popular worldwide and guest appearances have taken him to all the leading opera houses in Germany as {…}