Which Brian Eno track is this?
 

Info:
There is a video on YouTube with the title "Kilimanjaro - A Lost World". It is narrated by Will Lyman. There are several pieces from Brian Eno. An Ending (Ascent) is one, and there are others.

Question:
What is the name of the musical piece that places in the first 45 seconds? I'm having trouble finding it. I've not previously been familiar with Brian Eno.