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The Electric Company?
Skinnamarink TV?
Imagination Movers?
Singing kettle ???
They Might Be Giants did some educational songs here and there (like Roy G. Biv for example). I'm not sure if they did anything on network TV though, but I am pretty sure they had a whole album of songs for kids about educational stuff.
Parachute Express, maybe?
I wanna say maybe the doodle bops? But not sure.
I can't remember if this show is more '80s or '90s. I saw it in the US and I think it may have been regular network tv - but I'm not sure. A music band of adults in outrageously loud and crazy costumes sang educational songs. It was kind of like a Wiggles-predecessor and for a slightly older audience, I think. I think they sang about all kinds of educational concepts. They reminded me of the B-52s, which makes me think the show was probably more 90s than 80s. The single episode that really stands out, or maybe the show's intro, involved them wearing cliche Egyptian costumes (think King Tut and Walk Like an Egyptian). I'm pretty sure it was the same band/cast week after week. It did not run many seasons, as far as I can remember. Thanks!