*laughs at the ground singing about you being stalked *

Bethy, when/if you'll work more on this world, a good story to read would be John Steinbeck's The Pearl (it's more of a novella, actually). It's rather depressing, but there are songs for everything, as sort of a motif/symbol throughout the story. They aren't necessarily literal/physical, as in your world, but it'd be good reference to see how Steinbeck does it.

I was shocked when I stumbled upon this thread, because I've been toying with a similar idea: a world in which music is heavily involved. I haven't fleshed out many details yet, but I really like some of the ideas and suggestions I saw posted here. Is this thread dead? Are any of the ideas up for grabs, so to speak? 'Cause I'd seriously consider using some of them but I don't want to get in trouble. Although if what I use is different enough I suppose it wouldn't be considered plagiarism.

I recommend the book Auralia's Colors, because in it there's a song that's sung traditionally every morning, and one for the evening too.
Also, in the beginning of the Silmarrilion, it talks about the beginning of the world coming about through a song that God (called something else in it) was constantly making more and more beautiful, and all the angels had a part in it. But then it was made twisted by the guy who is like Lucifer, but God still made it turn out more beautiful in the end because of it.
Music has frequency with light and dark, sadness and happiness, and different dimensions to it. I think it has the ability to take us to different places.