Balkanika Music Video provides groupings of music videos made by artists from Balkan regions, organized by what is popular in each country.
Popular Music Artists change constantly so if you want to see what is currently popular in any of the countries of the region, check out top 100 charts that can be sorted by country. For example, Spotify.
Another such site is "Charts All Over the World." A little messier to use this is still a very good site linking the user to the top songs listed by various pop radio stations in each country.
The Turkish Music Portal through the Turkish Cultural Foundation offers information on the history and periods of Turkish music, lists of composers, performers, musicologists, types of Turkish music, Turkish musical instruments, samples of Turkish music, a Turkish music dictionary, and more.
The Republic of Turkey Ministry of Culture and Tourism offers information on traditional and local music, modern Turkish classical music, popular music, and other music examples.