Calypso is a style of Afro-Caribbean music that originated in Trinidad and Tobago during the early to mid 20th century, and lays it roots in the West African Kaiso and the migration of Martinican planters and their slaves. The music, which drew upon African and French influences, became the voice of the people, and was characterized by highly rhythmic and harmonic vocals, which was most often sung in a French creole and led by a Griot (a West African historian, storyteller, praise singer, poet and/or musician). As calypso developed, the role of the griot (originally a similar traveling musician in West Africa) became known as a chantuelle and eventually, calypsonian. As English replaced patois (creole French) as the dominant language, calypso migrated into English, and in so doing it attracted more attention from the government. It allowed the masses to challenge the doings of the unelected Governor and Legislative Council, and the elected town councils of Port of Spain and San Fernando. Calypso continued to play an important role in political expression, and also served to document the history of Trinidad and Tobago. * From Wikipedia.