Belafonte's beat (7)
I believe the answer is:
calypso
(Other definitions for calypso that I've seen before include "Sea nymph of Greek mythology - Caribbean ballad" , "Ballad - dance - orchid - sea nymph - moon of Saturn" , "W.Indian ballad dealing with topical events" , "W. Indies music" , "Odysseus was delayed by her" .)