Getting there is half the fun, as the old saying goes, but the journey is really the whole point for Boston progressive-folk duo Tall Heights. Singer/guitarist Tim Harrington and singer/cellist Paul Wright know where they’ve been, and where they want to go. As for the route, well, “we’re just mapping it out as we take it, day by day,” says Harrington.

The band’s broadening sound came from the musicians’ conscious effort to push themselves, and each other, to create in new ways. By relying on a few core elements at the start, the duo learned to make the most of their minimalist set-up. “It taught us to be lean and mean and effective with just two voices and two instruments,” Harrington says. “It made us consider vocal tone and the way voices can mesh and interact.”