The whole Miku Hatsune[0] phenomenon has the front end of this idea. If someone combines something like OP (which is the 2nd best classical algorithmic music project I've listened to) with some musical AI like Jukebox[1], most of the back end would be done.

The missing parts would be the choreography and visual design. I also wouldn't personally say it's done unless it is marketing itself. At which point we are in singularity territory.

[0]https://youtu.be/YSyWtESoeOc

[1]https://openai.com/blog/jukebox/