Ska at Wikipedia http://en.wikipedia.org/wiki/Ska Ska (pronounced /ˈskɑː/, Jamaican [skja]) is a music genre that originated in Jamaica in the late 1950s, and was the precursor to rocksteady and reggae.
Ska combined elements of Caribbean mento and calypso with American jazz and rhythm and blues.
It is characterized by a walking bass line accented with rhythms on the offbeat.
Reggae at Wikipedia http://en.wikipedia.org/wiki/Reggae Reggae at Wikipedia
Reggae is a music genre first developed in Jamaica in the late 1960s.
While sometimes used in a broader sense to refer to most types of Jamaican music, the term reggae more properly denotes a particular music style that originated following on the development of ska and rocksteady.
Reggae is based on a rhythmic style characterized by accents on the off-beat, known as the skank. Reggae is normally slower than ska. Reggae usually accents the second and fourth beat in each bar.