AdvertisementHow Rock 'N' Roll Can Explain The U.S. EconomyJune 15, 2013Scott HorsleyfacebookEmailBruce Springsteen performs during halftime of the Super Bowl in Tampa, Fla., in 2009. In music, and increasingly in other industries, a relative handful of top performers take more and more of the spoils, says White House chief economist Alan Krueger. (AP)