In 1998, Wilco and Billy Bragg joined forces for _Mermaid Avenue_ , an album of previously unheard lyrics written by the late folk icon Woody Guthrie organized by his daughter Nora. It was followed by a second volume a couple years later, and a third in 2012 as part of the _Complete Sessions_ box set. The project featured additional musicians, such as Natalie Merchant, and last night at Wilco's…