I bought a London/Decca film music LP box set because of a rarity: It contained the Bernard Herrmann The Day the Earth Stood Still suite, but with two cues that were deleted from the suite on The Fantasy Film Worlds of Bernard Herrmann. One of the two cues was the classic "Klaatu," which was also used frequently in Lost in Space. The problem was that the Decca/London version was played poorly, which is probably the reason it got cut from The Fantasy Film Worlds.
So, in other words, I bought a box set for two tracks, and they were duds. At least I didn't pay much for it.