Sweet! In the Odessa region, which wasn't covered by this project according to the map, the rhythms were more Balkan / oriental and mostly instrumental (melting pot of the world - just like the people living there). That's where the klezmer music originated - and later managed to escape the Holocaust to America/Hollywood:
There was a nice Ukrainian music festival in London last summer. If you like such regional curiosities, I'll let you know if they organise it again.