Annie Lennox says complacency threatens to slow the fight against AIDS.

The singer-songwriter is participating in the international AIDS conference in Mexico City this week as an ambassador for Oxfam.

On Saturday, she urged artists, musicians, filmmakers and women to keep the issue at the forefront. She says, "This dialogue must not go off the table."

Lennox has launched a campaign called "Sing," which includes a song she recorded with 23 female singers to raise money for AIDS. She also is campaigning on behalf of South African women and children infected with HIV.