You can't just put a CC license on the song with an asterisked footnote that reads "just the bass, though."
CC *had* a sampling license: the "Sampling Plus 1.0" license. It was a *mess*. Licensees couldn't figure out what parts of works they were allowed to use, and licensors couldn't figure out how to coney that. It's been "retired."
https://creativecommons.org/licenses/sampling+/1.0/
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So maybe Willingham should create his own bespoke license for *Fables*. That may be what he has to do, in fact. But boy is that a fraught business. Remember the army of top lawyers who created the CC licenses? They missed a crucial bug in the first three versions, and billions of works have been licensed under those earlier versions. This has enabled a mob of crooked #CopyleftTrolls (like @PixsyHQ) to prey on the unwary, raking in a fortune:
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Making a bug-free license is *hard*. A failure on Willingham's part to correctly enumerate or convey the limitations of such a license - to list which parts of *Fables* DC might sue you for using - could result in downstream users having their hard work censored out of existence by legal threats.
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