NEW : Spokesperson for fined stage-builder disputes investigation 's findings . Comment: Mid-America Sound Corp. hit with the largest penalty -- $ 63,000 for three violations . Sugarland , the Atlanta-based duo of Jennifer Nettles and Kristian Bush , escaped injury since they had not yet come onstage . Announcement comes after a six-month probe into worker-safety issues .
NEW : Spokesperson for fined stage-builder disputes investigation 's findings . Comment: Mid-America Sound Corp. hit with the largest penalty -- $ 63,000 for three violations . Announcement comes after a six-month probe into worker-safety issues .