Last week I interviewed Sarah Jarosz, a 19-year-old roots musician who’s making her Spoleto debut on Thurs. June 2 at the Cistern. When we spoke, she was still at school in Boston (New England Conservatory of Music) gearing up for the end of the semester and the beginning of her biggest tour yet. From the Punch Brothers to the Carolina Chocolate Drops, bluegrass has brought a vibrant young crowd to the last few festivals, so it’s probably a good idea to buy your tickets soon if you want to see Jarosz’s show. Check out her cover of Tom Waits’ "Come On Up to the House" for a taste of what’s to come.