Retro! Totally enjoyed your chronicle of how library tunes invaded your life. Your other interests and circumstances are strikingly similar to mine. And many others among us, I reckon. You asked, "What's your story?". Here's a shortish version...
Barely a teenager in 1970, I heard the Capitol Hi-Q cuts in NIGHT OF THE LIVING DEAD. I knew I'd heard some of the music before, just didn't know where. The movie was so incredible that I listened to everything with a heightened awareness. It was my first real notion that a film's music wasn't necessarily original to it. I needed to find out why and how to get my hands on it. Thus, the hook was set.
To somewhat mirror your "Stop, Look, Listen" moment in Miss Blackwell's class, I was in high school--Mr. Crater's
World History class--where I watched a 16mm short subject entitled "The Mythology of Greece and Rome" (which can be viewed here if desired: archive.org/details/mythologyofgreeceandrome_201505). Its lush main title stunned me. Absolutely taken by it. By then I knew enough that it had to be a library piece. As a kid in the 70s with such an esoteric interest, trying to research the music's source was near impossible.
Skip ahead a couple of decades when me and a friend were doing some trading. He pulled out a library LP--something he happened to have, but didn't collect--and offered it up. It was Boosey and Hawkes SEA, LAKE, ETC. (SBH 2998) and I gladly traded for it. Lo and behold! Trevor Duncan's BROAD REACH (Side A - Cut 1B) thrust me back into Mr. Crater's classroom, for there, playing on
my turntable (!), was what I had only known as the main title for "The Mythology of Greece and Rome." I dang near cried.
Your 100 KPM records find (my Gawd!) reminded me of a book and record sale I went to in NYC during the 80s. For 75 cents each I bought roughly 80 CAM LPs that were unplayed. It was thanks to a friend's tip that I even bothered to go.
Also wanted to thank you for all of the sensational comps you've created. Clearly the work of a learned hand