Robertson's stuff was "early" space-music, by which I mean stuff you might hear at planetarium shows or the dreamy synth stuff you used to hear in the "old" days (read: 1980s) of Music from the Hearts of Space).
Here are the tracks:
1) Horizons Beyond Infinity 18:37
2) Stardance 7:16
3) Starjourney 6:34
4) Gymnopedie 8:53
And here are the spatial coordinates.
See you Thursday!