Sales prices vary depending on a multitude of factors. There’s no single sales price that exists for one album/track/etc.
iTunes charges differently to Beatport. Beatport charges differently to direct to fan over Bandcamp.
B) Furthermore, you’re assuming independent artists earn in a linear fashion which is just not the case.
I have been toiling away for 10 years making music. I don’t earn enough to pay original sales price x 10 every year to keep my work in copyright. So 50% of my work is now public domain.
Now let’s suppose I “make it big” tomorrow. 50% of my hard graft over the last 10 years was for nothing. Everyone can get my work for free. Maybe my recent album makes me a few bucks. But now I can’t re-copyright those earlier works.
As an independent artist, I’ve just been screwed by your proposed system.
Edit1- C) you’re assuming that everything that any musician does is released as an album. And sold to the public. How would you set the rates for something that only gets broadcast on radio and never sold?
Edit2- D) my point regarding B is actually one of he fantastic things about copyright existing for my lifetime +70 years.
If, at any point during that period I “make it big” then either myself, or my estate, are able to be paid for my hard graft.
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Music is inherent to our society, even our humanity. Personally, I think we should place appropriate value on it.
Lifetime +70 places a good value on the work musicians do in my opinion.