Music is the soundtrack of our lives, so it only stands to reason that songs have become the subtext to our political campaigns. At the FleetCenter they ranged from the obvious --... ...and U2 singer Bono told a group of young City Year volunteers that when he was their age he joined a band because he wanted to do two things: change the world and have fun. "I'm a fan of America, one of those annoying fans that follows the singer into the bathroom and asks what happened on the last album," Bono said to explosive applause, hardly needing to...