Lady Antebellum learned a hard lesson Saturday night … the National Anthem is neary impossible to sing. Charles Kelley, Hillary Scott and Dave Haywood were front and center at the playoff game between the Nashville Predators and Winnipeg Jets at Bridgestone Arena in Nashville, when they sang the song famously messed up by so many. They did not disappoint. Each sang a different verse during the pesky part of the tune, and the players try hard — though don’t succeed — not to crack up. They shouldn’t feel bad, even the best entertainers say the National Anthem is the hardest song to sing.