Protest doesn’t have to take the form of grim defiance. Arvo Pärt rebelled from Soviet conformity with a new and timeless voice of calm. Martinu wrote his Second Sonata in the US as a wartime exile from his beloved Czech lands, but he translated his exile into music of joy in adversity. In the hands of Weinberg and Casals, the cello becomes an extension of the human voice, conquering struggle with heroic defiance.