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The appellate court ruled that the voice of someone famous as a singer is distinctive to their person and image and therefore, as a part of their identity, it is unlawful to imitate their voice without express consent and approval."
I would not be surprised to see that precedent overturned at some point because its outcome seems to deny individuals the right to profit from their own abilities, just because they happen to sound like a famous person.
https://www.latimes.com/archives/la-xpm-1990-05-09-me-238-st...
Tom Waits Wins $2 1/2 Million in Voice-Theft Suit
In a novel case of voice theft, a Los Angeles federal court jury Tuesday awarded gravel-throated recording artist Tom Waits $2.475 million in damages from Frito-Lay Inc. and its advertising agency.
The U.S. District Court jury found that the corn chip giant unlawfully appropriated Waits’ distinctive voice, tarring his reputation by employing an impersonator to record a radio ad for a new brand of spicy Doritos corn chips.