Sugarland's Jennifer Nettles and Kristian Bush pick the lock on Taylor Swift's vault of unused songs for the second single of their comeback, "Babe," which even features a guest vocal from the pop superstar. The track was co-written by Swift with Train's Pat Monahan back in her Nashville days, intended for Swift's 2012 album Red. It didn't make the cut, but her loss is the duo's gain. The heartbroken track is built on vivid, lived-in lyrics in classic Swiftian fashion, but contrasted by a relaxed, roots-pop feel that is 100 percent Sugarland. The result is one heck of a chorus: a mix of warm, welcoming melodies and a processed beat paired with Swift's pulsating vocal. C.P.