What are some pop bands/singers that are popular in Eastern Europe?

The best artist is DARREN HAYES from Australia former of SAVAGE GARDEN.
He has homes in england i believe.

check them both out in I-tunes.

In Hungary, they have Omega,they have been around for ages.
i liked NOX but they have seemed to of disbanded. The singer and her boyfriend broke up, sort of messed up things.
i am into oldies so can't help much with the new stuff.

there's no artist that's originally from here, that's popular in every country, the only way that could happen is if all countries spoke the same language, which is not the case

Adam Tensta - Swedish rapper

Some popular bands and singers can be found on MTV Adria, which caters for the mainstream type of music promoted by MTV in general:

http://www.mtvadria.com/?lang=slo&lang=sr
http://en.wikipedia.org/wiki/MTV_Adria

If you're into different kind of music, check out

http://www.b92.fm/

This is the biggest music/video clips database in this part of Europe, and quite reliable in terms of ratings. It doesn't have any of the turbo folk music hits, but if you google this term, I'm sure you'll find enough sources of it in Eastern Europe.

As the others already pointed out, there are no singers/bands that are popular in the whole of this region, and every country has its own lists. They all however, listen to the world music, just like the rest of Europe&the US.