Jim C.: "That the pop industry was prepared not to include calypso to sell their product is surely the point - commercial enterprises do that sort of thing all the time."
Belafonte is/was considered a folk singer by millions of listeners around the globe and he is hardly a fan of capitalism today. But he is still cranking out those "King of Calypso" reissues and "Greatest Hits" comps.
"I assume you have come up with an alternative of your own - or somebody else's?"
If I'm dealing with Belafonte's music I use Belafonte's. When I move to the largest online database I'll find all "calypso" as a subset of "reggae;" where "Folk" is one third of "Folk/World/Country" and "Trad" appears only as a track credit (ie: neither genre nor style.) Different boats, different long splices. Twas always thus.