Robert Zero Karl Oskar Broberg (2 July 1940 – 21 July 2015) was a Swedish singer, composer and artist. As an artist, he used various names: Robban or Robban Broberg (1957–1968), Robert Karl-Oskar Broberg (1968–1974), Zero (1974–1982) and, starting in 1982, Robert Broberg, the name he used until his death.