Tuesday grooves on THE MEDICINE BALL CARAVAN (11am-noon Central Standard on KRVS Public Media 88.7FM locally or www.krvs.org) include the latest by Los Lobos, Lizz Wright, Buddy Flett, Marc Broussard and Alabama Shakes. Also: some David Egan, Mavis & Pops Staples, Tony Joe White and The Bar-Kays.