You may check below the track list of the Avatar soundtrack:

Avatar Soundtrack (Score & Theme Song) – Track-Listing

1. “You Don’t Dream In Cryo…” – James Horner 2. Jake Enters His Avatar World – James Horner 3. Pure Spirits Of The Forest – James Horner 4. The Bioluminescence Of The Night – James Horner 5. Becoming One Of “The People” Becoming One With Neytiri – James Horner 6. Climbing Up Iknimaya : The Path To Heaven” – James Horner 7. Jake’s First Flight – James Horner 8. Scorched Earth – James Horner 9. Quaritch – James Horner 10. The Destruction Of Hometree – James Horner 11. Shutting Down Grace’s Lab – James Horner 12. Gathering All The Na’vi Clans For Battle – James Horner 13. War – James Horner 14. I See You (Theme Song of Avatar) – Leona Lewis

Here’s the theme song of Avatar, “I See You” by Leona Lewis: