This was a nice immersive read; it's a poetic ethnography, painting a vivid picture of a culture that has fully embraced impermanence. The way the River and Mountain people are distinct yet united under 'the Flow' creates a nice thematic duality, and the idea that they build, create, and sing knowing they'll lose it all again is strangely comforting, like saying change isn't the end or something to fear.
The music sections stood out to me, especially how each group's instruments are shaped by their environment (flutes from ibex horns, chordophones by the river), and how they come together through trade and shared song. I think this would've been the perfect opportunity to experiment with already existing instruments to really sell the focus on both the music of the wind and water! I loved the tracks musically; I just wish I could've heard your idea of how these instruments would sound (playing around with effects, sidechaining wind or water, maybe making the flute overblown). I wanted to hear how your chordophone would've sounded since it was the main star!
Overall, it feels like a world that's been carefully thought through, not just in terms of geography, but in how the people's beliefs, tools, and daily lives all echo the same core idea: that change is the only constant, and meaning comes from participating in it, not fighting it.
I've got some wildlife concept art I've done for the previous jam where the theme was Skylands, and I could honestly see them living in your world you've created!
Great job with your submission, you two!