Celebrity presenters at the show also will include actors Salma Hayek, Natalie Portman, Chris Tucker, Jennifer Connolly, Jimmy Smits and Kami, an HIV-positive Muppet from the South African version of "Sesame Street," organizers said Monday. The show also will feature host Will Smith and performances from Bon Jovi, Destiny's Child, Linkin Park, Maroon 5, the Dave Matthews Band, Jay-Z, Keith Urban, Maroon 5, P. Diddy, Rob Thomas, Sarah McLachlan and Stevie Wonder. Hip-hop impressario Russell Simmons has signed on as a producer. The Philadelphia show is one of nine concerts aimed at pressuring leaders of the world's richest countries, the G8, to cancel Africa's unpayable debts and double aid for the continent. The concerts take place days before G-8 leaders meet in Scotland. The other concert sites are in London; Moscow; Paris; Berlin; Rome; Tokyo; Barrie, Canada; and Johannesburg, South Africa. In the United States, VH1 and MTV will air eight hours of the concert, while America Online, which owns the U.S. rights to the concerts, will beam them on the Internet.