Watch Henry Rosmarin’s full testimony from the Visual History Archive as part of Comcast’s Days of Remembrance: PastFORWARD broadcast April 15-June 1, 2015. The sound of a harmonica usually brings to mind playfulness, joy, a sense of merriment. For Henry Rosmarin, it is also conjures the darkest chapter of his life, when his talent for music earned him favor with a Nazi commandant and kept him alive in a German concentration camp.