Celtic and Americana folk ensemble SisterTree renders radiant, expansive harmonies for strings and voices, and kick it back with old favorites and downright far-fetched selections. Roving over the wild and storied landscapes of life, they invoke ancient memories of revelry and bonfires, song circles and storytelling. From lilt to throttle, they are Gaia’s sirens atop the scrape of a mountain ridge, awash in an avalanche of energies hauled up from the bones of earth to the starlight.