T. - Hmmm, I'm not sure I understand your questions exactly, so if this reply isn't responsive it's not because I'm being evasive. I belong to a Unitarian Universalist church, which accepts all forms of worship as valid. I don't know what denomination our speaker is, if any. On Sundays when the choir doesn't sing, I arrange for "special music" for the service. We have Irish music (non-religious) for the Samhain and St. Patrick's day services, Hebrew music for the Channuka service, and I'm not sure what the music was during the Hari Krishna service, but it complemented the service well. We had folk songs about rivers for a service about rivers, blues music about travelling for the service about journeys - you get the picture. Our regular services often use native american readings, but our hymnal has only one native american round (which disappointed me greatly). Our choir has sung arrangements of songs based on native american texts. My desire to provide music with a native american connection for this particular service is based on mere aesthetics, nothing more. I will give some more thought to your questions, though. And thanks for the links.
Mary and Bert - Thanks for the suggestions.
Katlaughing - A friend has the Libana book, I'll look at it. Thanks for the tip. I'll also send you a personal message, I'd love to have more material to choose from.