If you were to ask me where to find the most soulful jazz festival in Europe, I’d point you to a place you’ve likely never heard of.No big banners. No VIP zones. No giant LED screens.Just a clearing in a pine forest, deep in the hills of western Bosnia. A meandering stream. A wooden stage. And music that seems to rise directly from the soil itself.This is Zelenkovac.And this summer, quietly, gently, just like the festival itself, it turned 25 years old.