Hot selections for your Labor Day picnic on today's MEDICINE BALL CARAVAN (11am-noon Central Standard on KRVS Public Media 88.7FM locally or anywhere via www.krvs.org) include the newest by Pony Boy, Fantastic Negrito and Courtney Barnett. Also: tracks by Captain Beefheart, Nilsson, Ethan Johns, Cream, Ben Harper & Charlie Musselwhite, Butterfield Blues Band and Zappa/Mothers.