"He was, perhaps, the most powerful moneyman of them all. When Alan Greenspan talked, the financial world listened. So why didn't he say anything to stop the subprime lending abuses now roiling the U.S. economy? In our lead story, correspondent Lesley Stahl finds that out and much more from the former Federal Reserve chairman. He is credited with orchestrating unprecedented economic growth, a booming stock market and budget surpluses. He guided the economy out of the shock of the 9/11 attacks. But he also played the saxophone in a touring orchestra and married a network television news correspondent. In this double length segment, meet the public and the private man who had his hand on the levers of the U.S. economy through 18 years and four presidents."