One of them is just going to be a cameo walk on, selling records out of a plastic carrier bag, then getting on a stage to sing. It's meant as a knowing wink to people who know who he is, because the characters in the story have no idea who he is until he gets on the stage. I don't see any problem in getting permission from him, and trying to sell people records from a carrier bag is something he is quite famous for.
The other has a more important role, because he instigates a fight that ends up inolving some of the characters, and a lot of the plot hinges around events that take place as a direct result of that fight. That one I might struggle with, so far I haven't found any contact details for him.
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