Harold George Belafonte Jr. is a Jamaican American musician, actor and social activist. One of the most successful popular singers in history, he was dubbed the "King of Calypso," a title which he was very reluctant to accept for popularizing the Caribbean musical style with an international audience 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.