Music-Brooks and Dunn

FILE - In a April 19, 2010 file photo, Kix Brooks, left, and Ronnie Dunn accept the ACM Milestone Award during “The Last Rodeo” tribute concert, in Las Vegas. The country music duo closed out a 20-year career at Nashville's Bridgestone Arena on Thursday night, Sept. 3, 2010 with their 1991 debut single, "Brand New Man," during the encore. (AP Photo/Matt Sayles, File)