When I bought my first player in 1988 or so, I got three CDs to listen to: DARK SIDE OF THE MOON, PICTURES AT ELEVEN... and THE SECRET OF NIMH. I’d already had all of them on LP but the Floyd and especially the Goldsmith were headphone revelations.
I was in record retail for years and had already accumulated a lot of promo cds before I got my first player, but I remember vividly that the first 2 cds I purchased were the Warner Brothers cd of The Living Daylights, which had just come out, and Miles Davis' Bitches Brew. The Miles cd sounded terrible in comparison with the Columbia lp. CBS really butchered the sound on their first shot of transferring two of Miles' iconic albums: Bitches Brew and Kind of Blue. Their was a lot of outrage, and CBS/Sony eventually got subsequent releases right.
I can't really remember. I know that the first soundtrack I ever got on CD was this, way back when the film came out in 1991:
But that's obviously not a score.
I think, rather, it must have been this -- also acquired around the same time:
However, not the CD, but a cassette copy with my own, hand-drawn cover (a pencil drawing of Kyle MacLachlan/Cooper).
Both of these were really acquired before I became obsessed with soundtracks. I can't really remember what my first score CD was that also coalesced with my soundtrack interest. Maybe THE ABYSS or JURASSIC PARK or something a couple of years later. I'm terrible at remembering 'firsts'.
Star Wars A New Hope RCA Special Edition back in 1997...that and Van Halen's first album were the first two CDs I ever received. They were a christmas present--coincidentally the christmas I got my first CD player too.
For first soundtrack, I'd have to go back to the Lion King on cassette.