I'd love to listen to Rising World's music side. I vote in favour of a Rising World soundtrack. Music is an important part of anything that you tend to judge the game by how it makes you feel through music, and with setting the mood and atmosphere.
There's Minecraft, Rome Total War, & all sorts of other game music posted up there that helps advertise the game in a "word-of-mouth" manner (curiousity) that it also helps share people's stories. It helps spread the hype. If you're that worried then feel free to up it yourself while monetizing it & etc, etc.
I, myself, want to listen to it just to see where the game is going & how I should judge Rising World at this point & constantly as the weeks go by. It's still awesome listening to the background music of various games.
This is what people hear when they check out Minecraft:
What does Rising World have to share these experiences, to be nostalgic, and to "set the mood"? I heard it [the BGMs] in people's Let's plays, and I should pick up the game. With Red51 & Waveshapr permission I'd suggest doing as Waveshapr recommended to record underground then to up it. I'm highly curious. Hope I'm being respectful also 
I truly hope you & Red51 look into a radio object similar to what Grand Theft Auto 3+, Euro Truck Simulator 2 (pressing R), and Second Life has to share music with one another, even simply in your own world. It be awesome. No rush, nor disrespect, just that music plays a nice big part in everything 