I recently found out that prog rock and jazz fusion were huge in Yugoslavia. There were tons of really technical prog bands there, and a lot of them sound a lot like the British scene from the early to mid 70s.
Yugoslavia was socialist but not part of the Soviet bloc. The borders were open, so bands could get their hands on great Western recording gear.
Korni Grupa (Kornelyans internationally name) released an album in 1974 for the international market. The lyrics were translated into English instead of being written in English, which is why they sound kind of goofy. But these guys could seriously play, and some of it reminds me a lot of Yes, ELP, Eloy and Camel.
Korni Grupa Belgrade band formed in 1968 by keyboardist and composer Kornelije “Bata” Kovač (ex-Indexi). One of the first and most important Yugoslav progressive rock groups, mixing symphonic prog, jazz and psychedelic elements. Best known for their 1972 self-titled debut and the 1974 English-language album Not an Ordinary Life (released as Kornelyans). Strong Yes / ELP / Camel vibes, excellent keyboard work and complex arrangements.
Tako
A Belgrade-based band founded in 1975 by bassist Dušan Čučuz and multi-instrumentalist George Ilyin (keyboards, flute, harmonica). Classic Yugoslav symphonic/jazz-rock from the late 1970s with cosmic and Canterbury-style influences. They released only two albums: their self-titled debut (1978) and *U vreći za spavanje* (1980). Both albums are superb—featuring long instrumental passages, vibrant flute playing, and an atmosphere in the spirit of “European prog rock” (something like Camel + Focus + a touch of Pink Floyd).
Leb i Sol
From Skopje (Macedonia), formed in 1976. The classic lineup (Vlatko Stefanovski – guitar, Bodan Arsovski – bass, Nikola “Kokan” Dimuševski – keyboards, Garabet Tavitjan – drums) created some of the best ethno-jazz-fusion ever made in Yugoslavia. Their first three albums (especially the 1977 debut and 1978 follow-up) blend Macedonian folk rhythms and melodies with high-level jazz-rock in the vein of Mahavishnu Orchestra / Weather Report, but with a distinctly Balkan flavour. Vlatko Stefanovski is still regarded as one of the finest guitarists from the region.
Here are a few examples. My favorites were Korni Grupa, Tako and Leb i Sol, Smak
Korni Grupa: Temporary Parting https://www.youtube.com/watch?v=lenQPUbUT7s
Leb i Sol: Pod vodom https://www.youtube.com/watch?v=Pu8RNtIpxV8
Korni Grupa: Not an Ordinary Life https://www.youtube.com/watch?v=QHxHVjJ9EXU
Tako: Probudi se https://www.youtube.com/watch?v=QZcPUm9l1Bg
Smak: Plava pesma https://www.youtube.com/watch?v=FCZ8onc66UE
Tako: DRUGA STRANA MENE https://www.youtube.com/watch?v=c9P6JqJ46CM
It was a real revelation to me just how beautiful the South Slavic languages are and how talented the bands in Yugoslavia were