Tuesday's MEDICINE BALL CARAVAN (11am-noon Central Standard onKRVSPublic Media 88.7FM locally or www.krvs.org) hits the latest releases by Shemekia Copeland, Galactic and Low. Also: some J.D. McPherson, The Watson Twins, Ray Lamontagne, Wilko Johnson/Roger Daltrey and classic trax from The Rolling Stones, T.Rex, The B-52s and Crosby, Stills Nash & Young.