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9: If you want to retain 100% copyright of the song with the new vocals make that clear from the start with something like this: "I am not just purchasing the vocals, but also the entire rights to said vocals, thus I alone retain 100% copyright of them. Further, I will not accept an NOC (No Objection Certificate)." [When an NOC is offered, the singer retains the copyright, but has no objection to you using them whether for profit or not].

Simpler:

This is a Work for Hire. You have no expectation nor are you entitled to share in any copyrights on this work.

If the song has air/internet play in any form and if the singer is a member of SAG/AGMA or AFM, then he/she is entitled to some of the performance/streaming revenues. You do not pay these, however—the streaming services etc. do and the respective Union collects and distributes those monies, not you, not ever.

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