Ghosts are always with us, waiting for the right moment, or reason, to reveal themselves. Then a song, a stretch of road, or someone’s laughter hits your ear, and suddenly you’re back in the moment, feeling the rush of emotions as if time never moved on. For Eleanor and Bonnie Whitmore, two of roots music’s most accomplished songwriter/ instrumentalist/ vocalists, the ghosts chose to appear right as Covid became entrenched — when live music evaporated and people were isolated from each other.