I bought the cassette from which this was dubbed in the 1980s, at a "New Age" store. They were the only store carrying some of the music I heard on Music from the Hearts of Space.
Ah, well, the music is interesting and kind of calming. There are only two tracks:
1) The Depths Open
2) Free to Be
Here is the link: http://www.megaupload.com/?d=37VN9FG5