Mary Zimmerman has been wowing the world with inventive stage imagery, poetically conceived, since the late 1990s. Discussing Meredith Willson’s The Music Man—set in River City, Iowa—which she’s just directed at at the Goodman, the Nebraska-born Zimmerman says, “The sort of aural summer soundtrack of the rural midwest … the way the light is, the way the sky is, it feels very very familiar.” —L.J.