It happened near the end of Jason Isbell's set, right when he played "Cover Me Up," the romantic, twangy, bedroom-eyes ballad off his latest, Southeastern. Isbell in fact wrote the song about his band’s fiddle player and now-wife Amanda Shires, so it was surprisingly unsurprising when mid-way through, a pocket of the subdued crowd all turned and lovingly gazed at a couple who had just gotten engaged. Did someone just get married? Isbell asked the crowd. "Congratulations," he quipped. "I hope that song works as well for you as it did for me."