Sir Harold George Belafonte, Jr. is an American musician, actor and social activist. One of the most successful Jamaican musicians in history, he was dubbed the "King of Calypso" for popularizing the Caribbean musical style in the 1950s. Belafonte is perhaps best known for singing the "Banana Boat Song", with its signature lyric "Day-O". Throughout his career, he has been an advocate for civil rights and humanitarian causes. In recent years he has been a vocal critic of the policies of the Bush Administration.