Wall Street Journal: Cumulus Media new CEO Mary Berner is working hard to change the corporate culture at the second-biggest U.S. radio broadcaster, which is battling declining revenue and struggling with $2.5 billion in debt that starts coming due in three years. She required that staff return each other’s emails within 48 hours and relaxed the dress code. The latest of her spirited town-hall meetings featured a cheery video montage of skits and songs performed by staffers across the country. “There’s a direct correlation between [corporate culture] and financial performance.”