>But the AI would not be able to perform live on a stage

The vast majority of music consumption is by people that have never seen the artist live. Hell, I have no idea myself if there is a human behind it.

>what gives the right and permission for humans to exist anymore?

Nothing. We are just a mote in incomprehensibly small fraction of eternity. Eventually the process of equalizing entropy will erase all traces of our existence. Enjoy it while you have it.

> I can't imagine staying 3 hours in a crowded room looking at a robot or a computer screen, even if it produces great music.

May I introduce you to the runtime of The Lord of the Rings films?

Also the American Federation of Musicians' campaign against "robot" musicians replacing live musicians in movie theatres? https://www.smithsonianmag.com/history/musicians-wage-war-ag...