Ark: The Nields.
The popular Boston folk-rock duo of sisters Nerissa and Katryna Nields known for their Roches-style vocal harmonies. They specialize in songs of corrosive social observation, and their music is alternately upbeat and moody, sometimes luminous and sometimes stinging and gritty. Their new album, Circle of Days, is an homage to the calendar and the band’s enduring creativity and commitment to their craft. $25.