Lifetime for human copyright, 20 years for corporate copyright. That’s the golden zone.
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And that's not even touching the spurious lawsuits about musical similarity. That's what musicians call a genre...
It makes some sense for a very short term literal right to reproduction of a singular work, but any time the concept of derivative works comes into play, it's just a bizarrely dystopian suppression of art, under the supposition that art is commercial activity rather than an innate part of humanity.