
AT 9 o'clock on a recent morning Bruce Springsteen and the E Street Band were already half an hour into a rehearsal at the rock club Terminal 5 in Manhattan. As N.F.L. executives and a television production team watched, they were tightening their miniset of four songs -- dropping verses, streamlining segues -- to fit their 12-minute slot as the halftime entertainment Sunday at Super Bowl XLIII, expected to reach tens of millions of viewers. "My take on the Super Bowl?" Mr. Springsteen said after rehearsal. "Fundamentally it's a 12-minute party." [...]