 The line-up consists of Madonna (who sings solo on the second verse of the song), Anastacia, Isobel Campbell, Dido, Céline Dion, Melissa Etheridge, Fergie, Beth Gibbons, Faith Hill, Angélique Kidjo, Beverley Knight, Gladys Knight, k.d.lang, Sarah McLachlan, Beth Orton, Pink, Bonnie Raitt, Shakira, Shingai Shoniwa, Joss Stone, Sugababes, KT Tunstall, and Martha Wainwright.As Lennox reported herself on her official website, this song is about raising money and awareness for what she considers to be the HIV/AIDS genocide