Tuesday's MEDICINE BALL CARAVAN (11am-noon Central Standard on KRVS 88.7FM locally or www.krvs.org) feeds you the latest sounds by Los Lobos, Grupo Fantasma, Billy Gibbons and the BFG's, Chic Gamine, Lettuce,Tracy Bonham, Kurt Vile, Dylan Leblanc and Blitzen Trapper. Plus: tracks by Florence + the Machine, Can, David Crosby and Jethro Tull