Stocks rallied for a second straight session Friday amid another round of earnings reports. The Nasdaq and the S&P 500 rose 0.7% each. Meanwhile, the Dow Jones industrial average outperformed with an 0.8% gain. Procter & Gamble (PG), 3M (MMM) and Microsoft (MSFT) were among the blue-chip index’s best performers. Volume fell across the board in the stock market today.