Well...
Not to say that this isn't quite the lore to expect but, there are a few sections in which this new magic would be kinda problematic.
I've checked before with a few staff members and they've all said one cannot use the void to directly heal themselves or any others.
This is way too close to using Tahariae clerical magic, light illusion(I believe?), and fire evocation. What'd make it so different from just learning any or those that have already come up with the idea?
You can already create illusions that do such with either mental magic/ illusion.
You wouldn't necessarily need to shield from aura unless it's from a shade. And if you need a shield or projectiles that aren't natural elements that come from the void, you have Arcanism! Also, the part with sharp, invisible objects does sound quite overpowering, does it not?
Damaging one's soul? I've never heard of music or magic for that matter that can directly harm one's soul. Besides, it's quite overpowering to use in roleplay, just think: How would the person being targetted have rp'ed this through?
Not even with mental magic is one allowed to do this. Even if it is harmful, the farthest it should go is enough to influence a person to do something, not forcing them because it's wrong and not fair for the one being targetted.
Again, one can do this with the use of fire evocation, what makes this so special?
There's way too many weaknesses that a person would have to rp out when using this.
All in all, I'd just go over it again and make some major edits or just not do it. Not to bring you down on the idea of having musical magic in rp, but I personally just don't see how someone can enjoy using this in rp, or anyone else that it's being used on. But still like how you're trying! :)