"It's a New Orleans tradition that you can take any music and mess with it,” said Bruce Boyd Raeburn, the curator of the Hogan Jazz Archive at Tulane University. The key lyric is “They’re tryin’ to wash us away,” he said, because it is applicable to most periods of New Orleans history. “It captures that feeling that you’re trying to cling on to your culture, to your life, in the face of this wave of indifference, of racism, of malevolence and of water itself.”

The results of the exit poll, conducted at 40 precincts across Pennsylvania by Edison/Mitofsky for the television networks and The Associated Press, also found stark evidence that Mr. Obama’s race could be a problem in the general election. Sixteen percent of white voters said race mattered in deciding who they voted for, and just 54 percent of those voters said they would support Mr. Obama in a general election; 27 percent of them said they would vote for Mr. McCain if Mr. Obama was the Democratic nominee, and 16 percent said they would not vote at all.

ON a late February afternoon Gnarls Barkley, the duo known for its funny costumes and psychedelic post-hip-hop sound, was unmasked and at rest at a quiet hotel in Beverly Hills. Cee-Lo Green, the short, heavily tattooed singing and lyric-writing half, had just finished a snack of sushi. Danger Mouse, the tall, scruffy producing half, was wiping sleep from his eyes after a head-down nap on a marble table.

They were pondering how their second album, “The Odd Couple,” then unreleased, might be received, given the buzz that it was a good deal weirder and darker than their million-selling debut, “St. Elsewhere” from 2006.

“It’s going to be a surprise for me,” said Danger Mouse, 30, whose real name is Brian Burton, in a baritone you might hear on late-night soul radio. “It may be really big or really modest, I don’t know.”

Clues came much more quickly than the two probably expected...

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