Cellist Yo-Yo Ma, left, and Holocaust survivor George Horner, right, hold flowers as they bow after performing together on stage at Symphony Hall Tuesday, Oct. 22, 2013, in Boston. The 90-year-old ... more 
Cellist Yo-Yo Ma, left, and Holocaust survivor George Horner, right, hold flowers as they bow after performing together on stage at Symphony Hall Tuesday, Oct. 22, 2013, in Boston. The 90-year-old pianist made his orchestral debut with Ma, where they played music composed 70 years ago at the Nazi concentration camp where Horner was imprisoned. (AP Photo/Steven Senne) less 
1 / 10
Associated Press | Photo By Steven Senne
Tue, Oct 22, 2013 8:06 PM EDT