Rod Stewart, Katie Melua, and Sir Elton John feature on a single for victims of the Asian tsunami and Hurricane Katrina, which has gone on sale.
Sharon Osbourne came up with the idea for the single
The star-studded recording of Eric Clapton's Tears In Heaven will raise funds for Save The Children.
TV personality Sharon Osbourne is behind the project, which also features Mary J Blige, Gwen Stefani, Pink, Phil Collins and Andrea Bocelli.
It is being sold as a download through the 7 Digital website.
Osbourne originally conceived the single as a response to the Asian tsunami.
But the money affected will now also go to victims of Hurricane Katrina and other natural disasters.
She said: "The magnitude of these natural disasters surpasses anything we've seen in our lifetime.
"With this single and other relief efforts, our intent is to keep these tragedies at the forefront of everyone's minds. We must not forget and do all we can to help these people rebuild their lives.
"Music fans who purchase this single will aid the relief efforts and own an historic recording for which these talented artists graciously donated their time."
The song was originally written by Eric Clapton as a tribute to his four-year-old son, Conor, who died in 1991.
Ozzy and Kelly Osbourne also feature on the single, as do Robert Downey Jr and the band Velvet Revolver.