U2, Coldplay, Pearl Jam Added To MTV Disaster-Relief Show

'ReAct Now: Music & Relief' airs Saturday at 8 p.m.

More of music's biggest acts, including U2, Coldplay, Beck, the Red Hot Chili Peppers and Pearl Jam, have been added to MTV, VH1 and CMT's disaster-relief special, "ReAct Now: Music & Relief."

Norah Jones, Bon Jovi, Fiona Apple, Elton John, Jewel, Jon Stewart, George Lopez, Dennis Quaid, Big & Rich, Hank Williams Jr., Emmylou Harris, Buckwheat Zydeco, Sugarland, Allen Toussaint and Chris Thomas King have also been added to the show, which will air Saturday at 8 p.m. ET/PT. (Due to the new additions, the show has now been extended past midnight.)

They join a lineup that already included Trent Reznor, Kanye West, Kelly Clarkson, Green Day, Usher, Alicia Keys and dozens more (see "Kelly, Stones, Kanye Added To Massive Disaster-Relief Special").

Along with live and taped performances from studios in New York, Los Angeles and Nashville and from live concerts throughout the country, the show will feature testimonials from celebrities reflecting on Hurricane Katrina and its aftermath. Viewers will be encouraged to volunteer in relief efforts and/or donate to the American Red Cross, the Salvation Army and America's Second Harvest.

Find out how you can help with the Katrina relief efforts.

Watch "MTV News Presents: After the Storm" on Overdrive.

Watch MTV News' Hurricane Katrina Coverage On Overdrive.

Read personal accounts from Gulf Coast residents.

Watch the entire "ReAct Now: Music & Relief" concert on demand.

"ReAct Now: Music & Relief" will air commercial-free on all of MTV Networks' channels, including MTV, VH1, CMT, MTV2, VH1 Classic, mtvU, MTV Español, MTV Hits, MTV Jams and MTV Puerto Rico. Online, MTV's Overdrive and VH1's VSpot broadband channels will carry the show live, as will CMT.com. MTV channels around the world — including the U.K., Africa, Italy, Spain, Portugal, Denmark, France and Canada — will also air the event.

MTV Networks is also making the show available to other networks interested in airing the special in its entirety.

Also on Saturday, be sure to watch "MTV News Special: After the Storm," which premieres at 7:30 p.m. ET.

To find out what you can do to help provide relief to victims of Katrina, head to think MTV's hurricane relief page.