Tuesday's MEDICINE BALL CARAVAN (11am-noon Central Standard on KRVS Public Media 88.7FM locally or www.krvs.org) airs the latest by Randall Bramblett, Swampcandy, Blitzen Trapper, Brass Bed, Courtney Barnett, Low, Atlas Genius, Turbo Fruits and Richard Thompson. Also: vintage Them, Led Zeppelin and Creedence Clearwater Revival.