Songwriting duo Emily Burns and Aaron Markovitz have always been adapting. The two Michiganders met as individual music makers in the blues open-mic circles; then they studied their craft together in California, and wound up taking to the seas to cover Top 40 hits for a cruise ship’s dance hall. After that, they started a southern rock-inclined, neo-country quartet, called Escaping Pavement. But most of their fans started finding them after 2014, when they kept their intrepid-sounding name but pared down to just a duo. With just their voices, an acoustic guitar and a mandolin, they wrote and recorded an album (The Night Owl) that was heavy on melody-slung Americana and rollicking, twangy ballads that attained a radiance through their magnificent harmonies. Now, they’re adapting again, this time as Road Warriors.