MikeD is correct...Boat Bar won't have music...Drifters should still have music and Seastar stops their Saturday evening shows for the summer/low season months.
Just before you leave for your trip...you can check Negril.com home page and the entertainment page for upcoming events....when you get here to Negril, just ask around or check the signs in town to see what's happening musically.

You'll be happy to hear...we saw Rasta Ralphie the other day and we were happily commenting on how good he looked!!