When I was there in 1988 I ran across a group called Ken and the Cane Cutters at a hotel in Montego Bay. Not great musicians, but they were worth seeing.
Whatever you do, don't get sucked into the "Romantic moonlight boat ride up the river". The biggest ripoff ever! The bands wer drunk, acted like they had never played together before, all out of tune, it was pathetic! However, the meal was great, best jerk chicken I ever had.
Dunn's River Falls was worth doing, but everwhere you go there is extreme poverty and one ripoff after another.

Do not travel alone or at night, and if I were you I would avoid Kingston altogether.