Wow, someone actually captured and uploaded it: https://yewtu.be/watch?v=H0Ot5zHaMSY

While I can use this, I wish they would officially release an album of the full score cleaned up.

I've been searching for something like this to find this cue from The Sign: https://yewtu.be/watch?v=H0Ot5zHaMSY&t=13h43m10s

Which peaks at about: https://yewtu.be/watch?v=H0Ot5zHaMSY&t=13h48m30s

Indeed, there are several classical quotations in the score. A lot of it so teasing as it builds up and then abruptly stops. What a joy that they use live-recorded instruments! Confirmed in: https://www.bluey.tv/blog/bluey-musicians/

I guess I now have to watch the entire series to understand the context of these cues.