I never got around to listening to The Planets much, and I was familiar only with the obvious pieces (Mars, Jupiter). "Mars" was used for the music in the PC game Outpost that I was into for a while, but oddly listening to the real thing in context felt like the first time. Not as incessant as the Hydlide music but I think it was the only music in the game. It was a bonus track on the CD-ROM if you put it in a CD player.
"I once wrote part of a university paper on how The Planets is sequenced like a rock album."
Awesome! Elaborate if it's not too embarrassing.