Native North American music is tremendously under-rated in the world music genre.
Think about it. When you think of music in different parts of the world, there's a mysterious, exotic quality which intices the imagination. When you think of "Indians" in the southwestern United States, what do you hear? (hayahayahayahaya) When you think of "Indians" in the eastern United States, what do you hear? (hayahayahayahaya) When you think of "Indians" in northeastern Canada, northwestern, central Canada; what do you hear?
Does anyone think that all the music created by a whole continent of peoples all sounds the same?
Catalog of the biggest "Native" music supplier with info and samples:
http://www.canyonrecords.com/catcass.htm