What would be a good sad and emotional song to use for a Holocaust memorial piece?

For GCSE homework, I have to make an emotional piece showing my interpretations of the Holocaust. I have chosen to do a Windows Movie Maker presentation about the children who died but I want some good music in the background that might make people cry. :) Can I have some suggestions please? And bearing in mind i am 15, so nothing like Mozart. Please reply soon, as it is already two weeks late and I've got to get it in for tomorrow! x