The Bonny Swans
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"The Bonny Swans" is a track from Canadian musican Loreena McKennitt's 1994 album, The Mask and Mirror.
It recounts a tale in which a young woman is drowned by her jealous older sister in an effort to gain the younger sister's beloved. The girl's body washes up near a mill, where the miller's daughter mistakes her corpse for that of a swan. Later, after she is pulled from the water, a passing harper fashions a harp from the bones and hair of the dead girl; the harp plays alone, powered by the girl's soul. The harp is brought to her father's hall and plays before the entire court, telling of her sister's crime.
It appears to be based on the story The Twa Sisters.