Using music to teach the lessons of the Holocaust and Genocide

This link takes you to my website that I created as the end project for my participation in the Master Teacher's program for Holocaust studies at the Joan Bildner Center of Rutgers University.
http://www.music-is-our-witness.org/
The lesson plans on my website are designed to teach about the Holocaust and Genocide through music. The materials in each lesson plan on the site are totally web-based in order to make them free and available to all interested teachers. I would appreciate any information or links to music that you might know of that can be used to create additional lessons. The only criteria is that the music, videos, etc must be available on the internet free and without copyright restrictions. Thanks for the help!!