Mark Olson and Gary Louris' new disc may not be the Jayhawks reunion some fans hoped for, but it's a respectable set of mostly acoustic folk songs sweetened by the duo's bright, sibling-like harmonies. Most of the music here is slow and muted: In "Saturday Morning on Sunday Street," the two channel Simon and Garfunkel like they used to channel the Burrito Brothers. This isn't trailblazing work, but on tracks like "The Rose Society," Olson and Louris sound as though they were born to sing together. As they say in "Bloody Hands," "What the mind forgets, the soul retains."