She’s a songwriting prodigy best known for her No. 1 hit single “At Seventeen”; he’s a folk pioneer who got his start playing alongside Dylan and others at the famed Gaslight Cafe in 1960s New York City. They’ve been friends for more than 50 years, and now Janis Ian and Tom Paxton share the stage, their songs and their stories when they perform together on Thursday, April 23, at City Winery, 1030 Main St., Napa. 8pm. $38–$45. 707.260.1600.