Songwriter LP goes into the wild — as a singer

There’s a moment, when singer LP performs the song “Into the Wild,” that her face tightens and she purses her lips, even as she keeps singing. It happened show after show at the South by Southwest music festival, whether on sunny daytime stages, in dark clubs, or while rocking a ukulele, solo, in the middle of an Austin, Texas, street. She is trying not to smile.