The ASU Music Library has a good selection of music from Mexico and a small but growing collection of materials about Native Americans. Note that the official subject heading at the Library of Congress is "indians of north america." The tribes are grouped into five geographical regions. For some regions (marked * and in green on the map), we have enough materials for a more in-depth study. Other listed regions (yellow on the map) have at least one recording or text.
The best general reference work for native North America music is The United States and Canada, volume three from the Garland Encyclopedia of World Music (Music Reference ML 100 .G16 1998 v.3). For Mexico, see South America, Mexico, Central America, and the Caribbean, volume two from the same set (Music Reference ML 100 .G16 1998 v.2). Pages 241-546 deal specifically with the music of South America. A CD is included with the volumes.
Arctic and Subarctic Native Cultures
This region includes all Inuit (Eskimo) cultures of the Canadian North.