One of the most famous choreographers working today, Twyla Tharp is the person you call when you want to turn Billy Joel songs into Broadway catnip or get horses dancing in Central Park. Also, we hear what made “The X-Files” such a good fit for the conspiracy-minded 1990s, and why we’re primed for it to come back now. And the director Sebastian Schipper explains how he shot a feature-length thriller over the course of two hours in Berlin — in just one take.