Matt Stone. Music Department: South Park. Matthew Stone is a Jewish-American actor, writer, director, musician and animator who frequently collaborates with Trey Parker. They created and voiced in the South Park franchise. Matt voiced Kyle Broflovski, Kenny McCormick, Butters Stotch and other characters. He and Parker also worked on The Book of Mormon, Baseketball, Cannibal the Musical, Team America: World Police and Orgazmo.