I've come up with something
similar to the change/stability thing before. Naturally, I think it is neat. Madra's change, the "stabilizing change" seems like it could belong in the stability camp. Temporary change for the sake of future stability seems, on the balance, pro-stability. Also worth investigating: the nature of things that change in a stable manner, ex. the seasons, which while always changing, are orderly and stable in a broader sense.
It's not really a matter of pro/anti-stability or camps. Think of it like how in the eastern elements, elements can bolster each other instead of just countering each other. So in that sense, the realtionship between hearthfire (the stabilizing change element; destructive is wildfire, creative is forgefire) and actual stability is more like the relationship between water and wood.
Still stuck on the music as magic thing- Modern urban fantasy. The socially disempowered seek advancement through art. I want a JRPG where a lead a crew of rappers through the hood, killin' bad dudes with ill beats.
Kinda reminds me of "Barkley Shut Up and Jam Gaiden", except that that one's about basketball. (I'm not sure entirely why it reminds me of that)
The "Apprentice Adept" books have a somewhat similar magic system for at least some of the characters. The main character uses poetry to cast magic, and there's another character who uses sculptures.
On that note, one cool thing that could be done with this system is to have magic only function at full power through the true expression of the caster's soul. So in an RPG, instead of gathering abstract EXP or something, you could have a character get stronger by being inspired and moving closer to creating a masterpiece. It could be a symphony, or a rap, or a painting, a sculpture, a photograph, a bonsai tree, whatever speaks to that character. You could even have villains who use more mechanical magic, which is inherently weaker but easier to forcibly drill into someone (at the cost of stunting or destroying their ability to exercise true creativity, and thus true magic). I'm seeing villains that founded a wizard school in order to strictly control how magic is used and what magic users think it's capable of.