The Cynco de Mayo Spring Fundraising Edition of THE MEDICINE BALL CARAVAN on KRVS (11am-noon CST on 88.7FM or krvs.org) features some Los Lobos, Santeria, Lucinda Williams and Michael Juan Nunez. Also: The Jellyman's Daughter, Hayseed Dixie, Leftover Salmon, The Cactus Blossoms, Rasputina and more.