Xactly.

... I think that might've been me. Drat. I was so hoping someone else had independently arrived at the same conclusion; I have violent insecurity issues around floating my own ideas in semi-public.

(And hah, this is something I've been kicking around as a vidsong possible, although I'm not married to it.)

And heeeee, yes, exactly! They've got downtime, or at least time when they're doing boring repetitive work with their hands that doesn't require any brain involvement, and people do music under those circumstances.