The real question is legally does someone own their voice ? Is AI different than an impression? If i sang a song as a perfect impression of Micheal Jackson is that illegal and I have to pay a record label ?
After the Sex Pistols fired their original producer, he put together a band called The Ex Pistols and hired Dave Slave to sing vocals exactly like Johnny Rotten. Needless to say the Sex Pistols sued the fuck out of them and won.