On “Very Last Country Song,” multiplatinum country duo Jennifer Nettles and Kristian Bush imagine a world where we appreciate the things we stand to lose. And, well, we'd be out at least one exceptional, scrappy album of sad love songs — this one. Sugarland's third disc, recorded live in the studio, captures the band’s grittier concert sound. Drop the extra cash for the fan edition — Nettles's stripped-down twang sounds killer on “Wishing,” one of four bonus tracks.