The launch, which was set to take place on June 26, has now been changed to September 4 so that 50 Cent can complete some of the songs.
Curtis will feature collaborations by many other artists, including Dr. Dre, Eminem and Timbaland. Additional vocals will provided by Akon, Justin Timberlake, Mary J. Blige, Robin Thicke and Nicole Scherzinger from the Pussycat Dolls.
50 Cent will perform on June 26 for the BET Awards.