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but w/ blues music a lot of it could have been hard to figure out who they owed if they did owe anyone.

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Yes, this was one of the points I was making. A lot of those old blues riffs are "canon" fodder if you will. It would be like trying to pay royalties for "Happy Birthday".

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well, single riffs are fairly common throughout different songs, but there def are whole songs that they cover that they should have been paying royalites to (chess records etc), whether they did or no, i have no idea.