system
Given the following post, respond as if you're commenting on Reddit:
human
[Fraggle Rock] I'm not far into the series... But I have *many* questions. How do the Fraggles all know the songs they sing? It seems almost spontaneous but they all seem to know the lyrics and dance steps quite well.

Also, The Fraggles seem to live in the wall of an inventors shop. But on the otherside of the wall there isn't the world. It's a farm kept by The Gorg family.

Also, do The Gorg rule over actual land? Or are they terribly mistaken? There seems to be just 3 of them and seem to be quite upset by their lack of subjects.
gpt
The Fraggles don't live in a wall, they live underground. The wall just has a hole in it that connects to underground. If you watch the intro, you can see Gobo traveling down tunnels, which wind about underground and many of which are interconnected. The Gorgs live in a land that is connected to one of the tunnels. 

As for the songs and dances, they are cultural. The Fraggles live a life of fun and leisure, so song and dance happens often. You see and hear them enough growing up and you'll learn them. Basically, they've been exposed to them since birth and learned through observation like human kids.