We’ve been fans of Jenny’s for years. The singer-songwriter and one-time co-founder of the rock band Rilo Kiley has released 2 fantastic solo records in the last few years, leaning heavily on her rootsier side. She was fantastic at last year’s Telluride Bluegrass Festival (including several on-stage collaborations with her good friend Elvis Costello). And now we’re thrilled to welcome her to her first Folks Festival…