Harry Belafonte album whose first song is "Day-O" (7)

I believe the answer is:

calypso

(Other definitions for calypso that I've seen before include "West Indian song with variable rhythm and improvised words" , "West Indian music - nymph who kept Odysseus on her island" , "WI song" , "West Indian music style" , "ad-libbed, topical ballad" .)

I've seen this clue in The New York Times.

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