Larry Campbell and Teresa Williams

It took Larry Campbell and Teresa Williams a while to get around to finally recording a duo project. But it’s understandable. Since meeting in the 1980s, the couple have spent the bulk of their musical careers backing some of the most iconic names in American music, among them Bob Dylan, Paul Simon, Emmylou Harris, Sheryl Crow and Levon Helm. But their eponymous 2015 album was worth the wait. It’s a heartfelt and stirring example of American roots music that Harris aptly calls “truly transcendent.” Campbell and Williams play the Higher Ground Showcase Lounge in South Burlington on Saturday, March 12.