Tonight and next Wednesday, July 23, locals Eastern Blok will play their fluid and vivid Balkan-inspired jazz at Katerina’s, 1920 W. Irving Park, following screenings of films by the great Serbian director Emir Kusturica. Tonight it’s the riotous tragic farce Underground–the movie that introduced many Americans to the astounding brass-band music of Boban Markovic, whose orchestra plays around town five times this weekend–and next week it’s Black Cat, White Cat. Both nights the films play at 7 (sorry for the late notice!) and the music starts at 10. Cover is $8, and the bar’s offering slivovitz drink specials for an authentic Balkan buzz.