Wanting to sell remixes with permission from beat producers. How is this done?

I am helping a rising hip hop artist get situated in the industry and I've only represented an indie artist whose material is all original.

My question is this:

How does he go about gaining permission to sell his remixes with their beats on them?
Do i contact each one asking for permission or for what their fee is? We want to start marketing his remixes but want to do it legally, honoring those who wrote the beats.

Nell M. (booking for Eddwords)
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