Ordinarily, paying $48 to see live music is exorbitant. But for Portishead, that’s a bargain. The Bristol, England, group contoured triphop into tremulous torch songs thanks to Geoff Barrow’s noirishly edgy productions and Beth Gibbons’s heart-shattering lyrics and burnished vocals. In 2008, Portishead reemerged from a long hiatus with Third, an album featuring a bizarre combination of tumultuous krautrock and Wicker Man–inflected folk. This shocking reinvention translates incredibly well in a live context. Skip a few meals, if necessary. (WaMu Theater, 800 Occidental Ave S, www.wamutheater.com, 7:30 pm, $48, all ages)