Hi, Annie - Copyright law gets complicated, expecially with recent music. In the US, almost everything published before 1923 is in public domain (although I take it "Caimarusa" may be Canadian). So if you can find it in a book or sheet music published before 1923, you're home free. I'd like to know more about "Camarusa." I see that Carl Orff (click) used it in a music education program (although I suppose it can't be as exciting as Carmina Burana.
Marian Rose (click) of Vancouber, BC, uses it as part of a music education program called Step Lively. There's a contact address for Marian. I'll be she can tell you maore about the music and dance. Her books and recording look quite interesting.
Good luck - come back to this thread and let us know what you find out.
-Joe Offer-