Andrew Duhon’s Emerald Blue reaffirms his well-deserved status among New Orleans’ singer-songwriters. A masterful collection of beautifully recorded songs, the album pairs contemplative lyrics with the lovely melodies Duhon sings with heartfelt expression. The varied influences in Duhon’s music—John Prine, Jim Croce, Lightnin’ Hopkins, Mississippi John Hurt, Allen Toussaint and...