SUGARLAND The country duo turns over another new leaf with its new album’s arena-rocking sound If Sugarland’s new album, The Incredible Machine, sounds grand and full of ambition, that’s because its inspiration was, too. “We had gotten a call about writing a song for a 2010 Winter Olympics soundtrack,” says guitarist Kristian Bush. “So we started thinking, ‘If I were writing a song for a skier or snowboarder to play on their iPod before...