Another jamaican musician that comes to mind is the late and great Lennie Hibbert. Sort of the jamaican equivalent to Mulatu Astatke, in the sense that he was a schooled musician who made instrumental music playing the vibes (and organ etc).
Lennie Hibbert's "Rose Len" has got to be the best non-reggae instrumental ever made in Jamaica:
YouTube - LENNIE HIBBERT - ROSE LEN
Lennie Hibbert in a reggae fashion:
YouTube - Lennie Hibbert - Real Hot
