Swedish sisters Klara and Johanna Soderberg are still on their way out of their teens, so their music sometimes displays an earnestness that can chafe at those of us who have been around a little bit longer. You know what, though? We need to get pushed off of our crusty “Grampa Simpson” high horses sometimes, and the sympathetic harmonies that kick in about two minutes into “Ghost Town” certainly do the trick. That devastating regret-filled stanza about being left behind in someone’s memory doesn’t hurt, either. Young or old, we’ve all been there before.