Faith Hill joins Madonna, Celine Dion, Fergie, Pink, Gladys Knight, Bonnie Raitt, Shakira, Melissa Etheridge, Joss Stone and KT Tunstall on "Sing," a track from the upcoming Annie Lenox album. The song, described as a "feminist anthem" was inspired by Annie Lennox's involvement with Nelson Mandela's Treatment Action Campaign (TAC). TAC fights for human rights, education and health care for those affected by HIV and AIDS.
