This week, Velina Brown and Lisa Hori-Garcia of theSF Mime Troupe talk about the troupe’s summer show, “Oil & Water”, baritone Christian van Horn talks about his multiple villain roles in the San Francisco Opera production of “Tales of Hoffman”, and soul singer Vernon Bush stops by. He IS “The Wiz” in the current Berkeley Playhouse production of the same name. Plus, critic Joshua Kosman offers his classical picks for the month ahead. Open Air with David Latulippe, Thursday, 6/27 at 1pm.