Celine Dion posted a video message talking about her experience teaming up with 22 other female artists for the Annie Lennox charity single ‘Sing’, which is out December 1st and will raise money for HIV/AIDS organization Treatment Action Campaign (TAC). “When Annie got in touch, I couldn’t refuse. It’s a great song, and the Treatment Action Campaign is such a worthy cause. Please, show your support.” Check out more details on ‘Sing’ at annielennoxsing.com. Watch the clip below.