It’s the way they weave together threads of Music City’s folk, soul, and bluegrass legacies. It’s in the inspirational and revealing songwriting. It’s in their acoustic instrumentation, presenting mandolin, fiddle, acoustic guitar and bass in fresh roles. It’s in the pleasant tension between rousing energy and nuanced arrangements. And it’s in the voices, with two complimentary stylists up front and backed by the full band’s rapturous harmonies. Vocals are the emotional core and lure of Humming House. They are five voices deep, with a galvanizing male/female twin attack over the top. Humming House works out careful hand-offs and big harmonies, including frequent passages that are just vocalizing, chanting beautiful music on top of their robust instrumental attack.