Question: Which country Steve Swallow's wife is from?
Sentence (from "Carla Bley"): An important figure in the free jazz movement of the 1960s, she is perhaps best known for her jazz opera "Escalator over the Hill" (released as a triple LP set), as well as a book of compositions that have been performed by many other artists, including Gary Burton, Jimmy Giuffre, George Russell, Art Farmer, John Scofield and her ex-husband Paul Bley.
Relevant evidence: No