I was a bit surprised to hear how frequently the "ominous" music is reused episode after episode after episode. At first I thought perhaps that in season one, they were trying to save money by not re-scoring every episode. Season 2 definitely has more original music, but I still hear the re-use of prior material.
That was standard practice in television throughout the '60s and '70s; it was only sometime in the '80s that union rules changed to require an original score in every episode.
I can't imgaine wanting to listen to 2 CDs worth (at least) of the same thematic material cut over and over for different episodes.
I don't think you quite understand. Of course this set would feature only the original use of each episode score; there'd be no reason to repeat them. There have been other CD (or before that LP) releases of scores from shows that used lots of tracked music, such as The Twilight Zone
and Lost in Space
, and the albums only include the original use of each score. Naturally the same would be the case here.
There was original music written for 33 episodes of TOS -- plus Fred Steiner's arrangement of "The Star-Spangled Banner" for "The Omega Glory," the songs from "The Way to Eden," etc. That's a hell of a lot more than 2 CDs' worth of music. The amount of music written for those 33 episodes would've typically been in the vicinity of 20-30 minutes each, though some had less. That's maybe around 14-15 hours of original music, say, without any repetition of cues. Fifteen CDs would come out to 18-19 hours' of content, and we know there are a number of unused, alternate, and bonus cues being included. So it adds up pretty well.
To put it in perspective: to date we've had 7 album or CD releases of TOS scores, plus two Best of Star Trek
CD releases that included some TOS music along with other shows -- yet those albums only include music from 21 episode scores, and most of those are incomplete releases. So nearly 8 albums' worth of music only accounts for maybe 60% or less of what exists.