Reggae lyrics are often incomprehensible to Americans, as they are usually in an English- based but distinctly Jamaican Reggae was a precursor not just to the modern Jamaican style of Dub, but to American Ska (think No Doubt, Sublime, Reel Big Fish), Jam-bands (Incubus, Dave Matthews Band).
Calypso is a genre of Afro-Caribbean music that comes primarily from the island of Trinidad. The lyrics of traditional Calypso music are generally political in nature. Calypso music became something of an international craze when Harry Belafonte first scored a major U.S. hit in 1956 with "Day-O" (the Banana Boat Song).
http://youtu.be/hRha8ixhJR0 Rocksteady came about in Jamaica in the late 1960s. Derivative of: Ska American jazz R&B Traditional Jamaican metro (music).
Like ska, popular for street dancing. Frequently performed without a horn section. Rocksteady faded into Reggae by the late 1960’s. Many modern bands use influence of the sound, notably No Doubt on their album “Rocksteady”