Bill here's a link to a poorly done midi file, but you can get the idea ... the lead melody is played by a steel drum ...http://www.pcdon.com/midicalypso.html

and another bad one - lead is clearer on this as it is played by guitar ... http://midkar.com/world/world_02.html

lyrics here ... http://www.akh.se/harbel/lyrics/mary_ann2.htm

It's a Calypso tune, but I've found using a Merengue or Samba Rock style adds more to it ...
Chord progression is simple ..
t.