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You have to take into account the fact that it is the recording that has been released a very few artists own the rights to those even today. That would still leave you the issue of performance and publishing rights but a great many artists signed all of their rights away and never get paid beyond an original one-off fee.
You should start by approaching the American equivalent of our Performing Rights Society to see if anything is registered with them for the purpose royalty payments on those recordings.
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