Green Day, REM, John Cusack and Moby have pledged to help find housing for flood victims through the political organisation MoveOn.org.
"As a band we felt promoting the service was essential - literally a matter of life and death," said REM's Michael Stipe.
Outspoken
Singer Harry Connick Jr returned to New Orleans on Monday to survey the damage at his father's home.
"It looks like pop's house made it through," he said. "Everything looks like it's pretty dry."
Connick Jr visited his father's New Orleans home on Monday
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The jazz star has agreed to be honorary chairman of Habitat for Humanity's Operation Home Delivery, a long-term rebuilding plan for the hurricane-affected areas.
Connick Jr performed in A Concert for Hurricane Relief on Friday, which made headlines after Kanye West's outspoken comments against President Bush.
"George Bush doesn't care about black people," West said at the televised benefit in New York.
Actor Matt Damon has come out in support of the rap star. "I'm not a big fan (of Bush) so I let out a big cheer," he said on the TV show Access Hollywood.
"Hopefully Bush will come out now and address the issue."
Legendary New Orleans bluesman Dr John has also been critical of the authorities as he urged people to donate to relief efforts.
"If anybody in the government would've done something about the disappearing wetlands for the past 50 years, then this probably wouldn't have been as bad," he said.