Important for both old and young to hear. This audio document has the power to deepen knowledge and rock spirits. The British broadcaster who opens the piece describes the scene and provides a background in a way that elevates journalism to a level seldom, if ever, reached by reporters of today. As for the liberated prisoners of the concentration camp, their singing contains hell and hope at the same time. Most of us may never have heard anything like it. There are scars in their voices.