Today is Holocaust Remembrance Day, when many recall the millions of Jews and others who died at the hands of the Nazis. It has a special meaning for Robbie Hausmann, cellist for the Buffalo Philharmonic Orchestra. His German great-grandmother, Toni Marcus, was one of the 1.1 million people killed at the Auschwitz concentration camp. And when the BPO toured Poland last month, he visited the camp -- to honor her with music. He spoke about it with WBFO's Nick Lippa.