Artists from all genres of music came together last month and put out a compilation CD, with all proceeds aiding earthquake and tsunami relief efforts in Japan. Now, their attention has turned to an auction aimed to bring in even more money to support the Red Cross and victims of the devastation. Country stars taking part and donating memorabilia for the auction include Keith Urban, Lady Antebellum, Dierks Bentley and more.

The eBay charity auction, featuring over 200 items, will be broken up into two phases. The country items being auctioned off in phase one, from April 5-15, include signed guitars from Lady A, Eric Church, Luke Bryan and Little Big Town. Darius Rucker not only gave them a signed guitar -- the sports fanatic added an autographed football and a signed CD to the package, as well. Bentley donated handwritten lyrics to his hit 'Beautiful World,' plus a signed CD, signed photograph and a signed football, and Urban's auctioning off two concert tickets and a private meet and greet.

Phase two happens from April 11-21 and those charity auction items include a signed guitar from Willie Nelson. Rosanne Cash donated a blouse she wore on 'The Tonight Show' in 2006, plus autographed copies of her 'Black Cadillac' and 'The List' albums, a signed copy of her memoir, two tickets to any concert she has this year meet and greet passes. Actor Jeff Bridges donated an autographed guitar and a drawing of the seed maze from his own yard.

More items are expected to be added, and if you want to check out what is up for bid right now, head to the official auction site. EMI has also generously pledged to match every donation up to $1 million.