Thought i'd ask some history guys to help with a puzzle...i'm looking for footage of a large outdoor concert, there's a massive crowd chanting and swirling in front of a stage, there are blue/yellow flags being flown that resemble the flag of Kazakhstan, the band on stage are playing some sort of epic war horn that is droning across the crowd's chants.

The location appears to be Eurasian, I can't remember if the surrounding buildings have cyrillic or chinese signage, the video gives off le epic mongol horde vibe but I don't think it's filmed in Mongolia.

I've been searching through youtube videos of various horns and the closest I can find are the Carnyx (Celtic, doesn't fit location) and the Dungchen (Tibetan, closer but still doesn't seem right).

Can anyone with knowledge of historical horns help with identifying this clip? I'd saved it from /wsg a long time ago but have since lost it.