John,

The choral music is actually formally taught, which is the good news, and, if I remember correctly, there are even choral competitions--the music, rooted as it is in the music spread by missionaries, is, at least at the root, pan-Oceanic, but each island integrates their own particular tastes and traditions--years ago, there was a series of programs on American Public Radio that featured music from a variety of places--It has been so long that I have heard anything that I haven't a clue as to where to go for more info--

The Vanuatu web site above has some ethnomusicological links--none had music files, but there are at least offices and names, and that might lead you somewhere. Good Luck, and let us know what you find--