The New Orleans Jazz & Heritage Festival just wrapped its 50th edition. If you've never attended, there's no way to effectively convey the feeling of entering the grounds and hearing the energy surging at you from multiple stages. It's a roots music and American culture life goal. Those memories get a stir on a new silver anniversary box set, out today from Smithsonian Folkways. It's a trove of unreleased recordings drawn from the years 1974 to 2016.