How to make money Tchaikovsky by 2019 on sales of their works?

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Tchaikovsky died a long time ago and already earn not. In the years when he lived it was possible to earn on orders from individuals, also from concerts and sale of music. But there was no intellectual property law. After the death of Pyotr, His music became the cultural property of the people. Moreover, the heirs did not have. But even if I did, and if I wanted to earn, would be unable, because of intellectual property also limits the prescription, after which the fees shall be canceled and be free.
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