Sorry if this has been posted before..I know they've collaborated live before but didn't know this..
http://www.hitfix.com/blogs/immaculate-noise/posts/album-review-abigail-washburns (http://www.hitfix.com/blogs/immaculate-noise/posts/album-review-abigail-washburns)
"Chains" features pedal steel -- played by My Morning Jacket's Carl Broemel -- and Washburn's singing, which is not entirely unlike Stevie Nicks' exhalations on Fleetwood Mac's song of the same name.