Sean "P. Diddy" Combs and Michelle Branch have signed on to participate in two planned concerts as part of the previously announced World AIDS Day awareness-raising initiative.

Sean "P. Diddy" Combs and Michelle Branch have signed on to participate in two planned concerts as part of the previously announced World AIDS Day awareness-raising initiative.

Branch will perform at the Nov. 7 concert at Seattle's Experience Music Project alongside the likes of Dave Matthews and Missy Elliott, while Combs will join Alicia Keys for the Nov. 23 show at Capetown, South Africa's Green Point Stadium. Both concerts are being recorded for broadcast as part of a 90-minute special airing globally on MTV on Dec. 1, World AIDS Day.

The special will be offered rights-free to broadcasters worldwide, in an effort to reach a wider audience with the messages of awareness; MTV hopes to attract a worldwide audience of close to 2 billion people. In addition to MTV, Levi's, and YouthAIDS, the Bill & Melinda Gates Foundation, the Paul G. Allen Charitable Foundation, and UNAIDS (the Joint United Nations Program on HIV/AIDS) have offered their funds and services to make the concerts and the World AIDS Day special happen.

Westwood One's MTV Radio Network will also be distributing the audio broadcast to radio stations worldwide. For information on ticket sales for both concerts, please visit staying-alive.org.