While most know Annie Lennox as a rock star, she's also a devoted advocate for those living with HIV and AIDS. Lennox recruited 23 other well known female musicians to collaborate with her on the song "SING," which is a rock anthem about HIV. The song helped her launch the SING campaign, which continues to support women and children impacted by HIV and AIDS, especially in Africa. The campaign also raises global awareness about their plight. Lennox is also a UNAIDS ambassador.