The issue with making regulations of any sort is that they are difficult and, in some cases, impossible to enforce. How will it be proven that AI was the tool that was used to create the voice?

There will be people who will do what ever they want regardless of the legality.
Whether the regulations are enforceable also depends on how wide spread the violations are.
It also depends on what the rewards are for breaking these laws.

These new laws may in fact be useful to protect the likes of Taylor Swift, perhaps. It is unlikely that they will ever affect personally the vast majority of musicians. Whose voice is so valuable that it is worth going to court over?

This attempt to control technology by laws and regulations will fail in the case of people who are not subject to the enforcement.

Of course, we will continue to make laws and regulations and not because they are for our protection but because that are a business enterprise in and of themselves.

This AI cat is already out of the bag and will take more than regulations to control it.

“Amazing! I’ll be working with Jaco Pastorius, Charlie Parker, Art Tatum, and Buddy Rich, and you’re telling me it’s not that great of a gig?
“Well…” Saint Peter, hesitated, “God’s got this girlfriend who thinks she can sing…”