The role of the Ethnomusicologists as a whole (Wanda Bryant being one of them) in the film and its musical reflections also plays a vital key roll in the musical expression of the world of Avatar I hope she is back for the sequels and you can hear her interview , Avatars unique sound space expression owes a lot to work in this Area

https://youtu.be/9WI3kJIObHE

Just going to toss the name Klaus Baldelt into this thread .