I suppose for the same reason that movies and television shows have to license the soundtracks they use in their works of art. I guess it's not transformative enough? Not sure what the legal definition of a derivative work is, but I guess it doesn't include a simple pairing up of different mediums.
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Even if it wasn't -- honest question -- why would it be necessary to "license" their music?
This is a work of art. It's not for any kind of profit.
I suppose for the same reason that movies and television shows have to license the soundtracks they use in their works of art. I guess it's not transformative enough? Not sure what the legal definition of a derivative work is, but I guess it doesn't include a simple pairing up of different mediums.