Berlin's Holocaust memorial plays host on Friday to an open-air concert that will see musicians spreading out across the field of concrete slabs to perform a modern experimental piece. The performance by the Kammersymphonie Berlin of composer Harald Weiss' new piece "Vor dem Verstummen" ("Before Silence Falls") marks the third anniversary of the monument's opening to the public. The orchestra is to be scattered among the memorial's 2,711 gray concrete slabs. Conductor Lothar Zagrosek will preside over the early-evening concert from the center of the 19,000 square-meter (204,500 square-foot) monument. Television monitors will enable further-flung musicians - who will be positioned up to 50 yards (meters) away - to see him.