Cellist Yo-Yo Ma, right, greets Holocaust survivor George Horner in a rehearsal room at Symphony Hall Tuesday afternoon, Oct. 22, 2013, in Boston. The 90-year-old pianist will make his orchestral ... more 
Cellist Yo-Yo Ma, right, greets Holocaust survivor George Horner in a rehearsal room at Symphony Hall Tuesday afternoon, Oct. 22, 2013, in Boston. The 90-year-old pianist will make his orchestral debut with Ma Tuesday night, where they will play music composed 70 years ago at the Nazi prison camp where Horner was imprisoned. (AP Photo/Steven Senne) less 
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Associated Press | Photo By Steven Senne
Tue, Oct 22, 2013 5:26 PM EDT