Nerissa and Katryna Nields are the sisters and singers from the folkband the Nields.
In the summer of 1998, Nerissa and Katryna were asked to play Lilith Fair, but leave the boys at home. The performance was a success, and the sisters decided to do some shows on their own. This duo configuration, which Dar Williams jokingly dubbed "the Probe effect" (a term familiar to followers of Star Trek) allowed Nerissa and Katryna to travel to places in the country (especially the West Coast) that the full band hadn't been able to get to as often as their usual haunts in the East.

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