Tuesday's MEDICINE BALL CARAVAN (11am-noon Central Standard on 88.7FM locally or www.krvs.org) kicks off with tracks from the latest releases by Steve Earle and Massy Ferguson before diving into the new Sigur Ros, Kirin J. Callinan, Arjun and The National. Also: some Radiohead, Public Image Ltd., King Tuff, Charles Mingus and Jo Stafford.