From the contest site:
"To celebrate our current Native Instruments NKS Vocal Sales Special, we’re zooming in on the world of cinematic scoring.
We want you to get inspired by nature. Create a soundtrack to the wonders of the natural world in this video to be in with a chance of winning Native Instruments prizes. A variety of sounds have been provided by our partners. In your composition you must use at least one of the vocal samples provided to be in with a chance of winning. Other than that, you can use whatever instruments, effects, and sounds you think will work best – it’s all down to you!"