When artists fully capable of headlining their own tours choose to share a stage or make an album together, a winning combination isn’t automatic. Anyone out there have that Metallica/Lou Reed record in heavy rotation? But when songwriters, friends and mutual admirers Shawn Colvin and Steve Earle decided to tour and record together, the resulting Colvin & Earle album sounds like they were born to harmonize. An enthralling blend of covers (The Rolling Stones’ “Ruby Tuesday,” Emmylou Harris’ “Raise the Dead”) and excellent new originals like opener “Come What May” and gospel-tinged “Tell Moses,” the set is one of the year’s best folk releases. They’ll play most of it, as well as deep cuts from their respective catalogs, when they hit Spokane.