Thanks to this convo, I know now ska music is also Jamaican in origin.
First I heard of it was prob. the Mighty Mighty Boss Tones and Reel Big Fish in the 90's.
Later, Sublime, which is still bangin'.

I was in high school at the time and didn't really think about stuff like this.

Ska came out of WWII era stuff like radio spreading music from the southern US to Jamaica. American soldiers had records that found their way around the island.

It was very much a sudden cultural shift, fueled by new tech, that broadened the communication horizons of the Jamaican people.

Then the darn kids went and made rock music.