Thing is, the option to participate in the Eurovision Song Contest is, funnily enough, not based on the map of Europe, or even the EU, it is based on the EBU (European Broadcasting Union)
This article helps to understand how it works, to a degree.
www.eurovision.tv/page/about/which-countries-can-take-part
As for the quality of the songs/musicians. the whole thing is a farce. All the countries tend to present obscure or minor groups/singers. I imagine the greats would not participate anyway. No money in it for them, I reckon. It has become such a joke, I imagine they wouldnt want to participate in it even if there was money to be earned. I havent watched it for yonks - maybe 20/30 years!
I’m finished my festival poncho