Calypso music
The first major stars of calypso started crossing over to new audiences worldwide in the late 1930s. Attila the Hun, Roaring Lion and Lord Invader were first, followed by Lord Kitchener, one of the longest-lasting calypso stars in history—he continued to release hit records until his death in 2000. 1944's "Rum and Coca-Cola" by the Andrews Sisters, a cover version of a Lord Invader song, became an American hit despite the song being a very critical commentary on the explosion of prostitution, inflation and other negative influences accompanying the American military bases in Trinidad at the time. Perhaps the most straightforward way to describe the focus of calypso is that it articulated itself as a form of protest against the authoritarian colonial culture which existed at the time.
Rapso
Rapso is a form of Trinidadian music that grew out of the social unrest of the 1970s. Black Power and unions grew in the 1970s, and rapso grew along with them. The first recording was "Blow Away" by Lancelot Layne in 1970. Six years later, Cheryl Byron (founder of the New York City based Something Positive Dance Company) was scorned when she sang rapso at a calypso tent; she is now called the "Mother of Rapso".