Madonna is set to appear on a new charity single which has been written by the Eurythmics Annie Lennox.
Madonna will join twenty three other female acts, including, Joss Stone, Celine Dion and KT Tunstell on the song, 'Sing,' which will raise money for the Treatment Action Campaign (TAC).
The TAC was launched in 1998 and campaigns for the treatment of people with HIV and to reduce the number of new HIV infections in South Africa.
Lennox first became involved with the charity following her work with Nelson Mandela’s 46664 Aids charity in 2005.
Meanwhile, Lennox has also revealed that she plans to release a new album in October.
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