Country music knows heartache songs, and it’s singing one today. The country music community joins the nation and world in a state of mourning after a gunman rained bullets onto a sea of concertgoers at the Route 91 Harvest Festival in Las Vegas late Sunday night, killing at least 58 and injuring more than 400 people in one of the deadliest mass shootings in American history. Country star Jason Aldean was performing onstage as the gunman, perched on a high floor of the Mandalay Bay Resort and Casino, interrupted the three-day festival with a hail of gunfire from automatic weaponry.