Wednesday's MEDICINE BALL CARAVAN (11am-noon Central Standard onKRVSPublic Media 88.7FM locally or www.krvs.org) airs new and recent tracks by Markus James, Robert Plant, Regina Carter, Lost Bayou Ramblers,Bonsoir Catin, Sean Bruce and Trigger Hippy. Also: The Revelers, Canned Heat, Michelle Shocked ad Cream.