The ASU Music Library has a small selection of materials about the music of the Pacific Ocean or Oceania. Listed countries have at least one recording or text. In addition to the individual countries listed below, try the general headings "music polynesia" and "music oceania."
General Sources:
The best general reference book on music from the Pacific is Australia and the Pacific Islands, volume nine from the Garland Encyclopedia of World Music (Music Reference ML 100 .G16 1998 v.9). A CD is included with the volume.
Australia
French Polynesia
Hawaii
Micronesia
New Zealand
Papua New Guinea
Samoa (and American Somoa)
Solomon Islands