In September 2015, Williams, along with bass player Kasim Sulton, led a global virtual songwriting collaboration at Hookist.com. The mission was to write the 1st ever crowd-sourced anthem to be performed at FacingAddiction.org's concert and rally on The National Mall on October 4, 2015, headlined by Steven Tyler, Sheryl Crow and Joe Walsh among others. The theme of the song was "Celebrate Recovery" and the goal was to reduce the stigma associated with addiction. Williams, Sulton and Dr. Mehmet Oz opened the show and led 10,000 people in a singalong of "Voice Of Change" at the base of the Washington Monument. Sulton also led a singalong of the song on "The Dr. Oz Show" which quickly went viral.