Looking at daily headlines, you'd think the radio would be filled with songs of revolution and protest. President Bush's approval ratings recently dipped below 30 percent — the third lowest of any president in the past half-century. Gas "It's like Public Enemy and N.W.A were warring for the heart of the hip-hop nation, and a gentrified version of N.W.A won out. The blingy version." -- Audioslave's Tom Morello prices have more than doubled since he took office. Plus, the Iraq conflict is more unpopular (nearly 60 percent of those polled say sending troops was a mistake) after three years than...