Question: Who wrote and performed as a duo with her sister Anna McGarrigle, and wrote "Proserpina", the album's first single?
Sentence (from "Kate McGarrigle"): Kate McGarrigle, CM (February 6, 1946 – January 18, 2010) was a Canadian folk music singer-songwriter, who wrote and performed as a duo with her sister Anna McGarrigle.
Relevant evidence: Yes