Aidin Vaziri | The songs on Lucinda Williams’ new double album “Down Where the Spirit Meets the Bone” — by turns unhinged and deeply measured — don’t necessarily lend themselves to being played in front of tens of thousands of people at an open-air festival. But the Los Angeles singer-songwriter, 61, has a surefire plan for her appearance Friday at Hardly Strictly Bluegrass. “When we do outdoor shows like that, we try to rock it up a bit more,” she says. “We do some of the more recognizable songs — my, if you will, hits, like ‘Drunken Angel,’ ‘Side of the Road,’ ‘Joy.’ What’s surprising, though, is that people will pay attention to everything.” Not that Williams has much to worry about. Several critics have already hailed “Down Where the Spirit Meets the Bone” as one of the best releases in her 30-plus-year career.