A Gibson guitar signed by every artist performing at this weekend's global Live Earth extravaganza will be auctioned online for charity.

The acoustic Gibson J45 will come adorned with the autographs of a galaxy of celebrities including Madonna, Duran Duran, Alicia Keys, Ludacris, Genesis and The Police.

The instrument, which is made from rainforest-certified mahogany, will be sold on auction website eBay. All monies raised will benefit The Alliance For Climate Protection.

(This news article provided by World Entertainment News Network)