Canntaireachd (also called Cannie for short, due to a name that would have even a sober man tripping over his tongue) is the cittern player in the Oasten Eleusia - the restaurant of Eleusis.
While she is incredibly talented, the fact she only knows one song to play is quite apparent.
She has been employed along with Celede, the serving wench, by the hostess of the restaurant, Anil-Gadith.