Contact all the beat producers for ur mixtape and get their permission to use the beats. If the beat has a Sample from another work used in it, and the sample hasn't already been cleared, then u need to get permission from the original works owner.

Make a list of samples that are used in beats on the mixtape and contact www.ascap.com, or www.harryfox.com.

One of these orginisations should be able to answer your licensing questions.

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