Calypso is a genre of music that originated in Trinidad and Tobago in the early 20th century. It is characterized by highly rhythmic and harmonic vocals, and traditionally sung in a French-Creole dialect. Calypso played a significant role in political expression and social commentary, often used as a tool for voicing issues in the society. Notable Calypso artists include Lord Kitchener, Harry Belafonte, whose album "Calypso" became the first LP to sell over a million copies, and Mighty Sparrow, considered one of the best Calypsonians of the post-war age.