I dont think this coin has any incentive for musicians to use it because of the infinite coin supply and your assumption of future growth. There are many other crypto avenues being created for musicians to make money from their music, and more will probably come to light.
One of the fundimental lures of crypto is that they dont do what the banks do and thats make infinite money out of nothing, you are doing the same thing.
You can easily get caught in a downward spiral if at anytime not enough people use this coin. This can create its own catch 22 situation where it will not pick up enough interest, and if it does pick up at any time still runs the same perpetual problem.
It also doesn't incentivise musicians to hold onto their coins once earned for the same risks which adds to the problem.
I think musicians who want to make money will use other options.