You'be be surprised at how many people outside of the score lovers circles, think if some "song" isn't credited, all they need to do is find the name and they'll go to iTunes or some such site. Or that if some "song" isn't on the soundtrack, then it wasn't done by the person credited for the music.
Over the decade or so more than once I've had to tell non score fans that they're not songs, they're score cues, created by the show's original score composer, and that sorry to tell them but many cues simply have no names; the cue sheet may simply read for the cue in question, 1m1.
I know about the score parts you're talking about. But in this case i am sure that it is now part of the tv show. The YouTube Video creator did put that one under it, it did not run in the original scene. I actually heard that theme a few years ago, but can't remember where that was. So i thoght it may be an famous piece. I could be wrong.
