Listen carefully to Curtis Mayfield's earlier work. He loved mixing up his musical influences and adding his flavour to the composition.

Copyright should be more a matter of fair use principles instead of IP this, IP that. Per industrial sector "in context" you can then make codes of conduct and basic rules of how and when to use someone else's work for one's own work.

Just my opinion. Copyright and IP-legislation is a minefield and the legal sector is reaping the benefits.