 "Hard Candy" features additional vocals by Timberlake, Timbaland, Pharrell Williams and Kanye West and production by Madonna, Timbaland, Timberlake, The Neptunes and Nate "Danja" Hills.Previously, Madonna had worked with relatively unknown producers like William Orbit, Mirwais Ahmadzaï and Stuart Price.However, for "Hard Candy" Madonna decided to collaborate with producers and artists who were already well-known.