““Unfasten,” a new song by the Atlanta-based singer/composer Hanna Benn, strikes a careful balance between opposite elements: grace and force, drift and roots, acoustic tones and electronic circuits. Benn is schooled in both gospel and opera, but the chamber pop of “Unfasten” has an icy, almost minimalist clarity that is unusual in either genre. At the song’s beginning, as she layers wordless coos ”
