Mainstream music was created for a good 20 years using the following process:

1. Do the survey/focus groups to figure out a hot topic for a song. For instance your exploration shows that 300K girls between 13 and 17 years old were left by their boyfriend, so there is a 300K market for a song about that.

2. Find someone or group who will sing the song. Something your target audience will identify. E.g. "rebellious teenager" (take Britney Spears), "we need a group that will attack larger target" - take Spice Girls - we take one black, one white, one Latino looking (doesn't have to be real Latino, obviously), one polite and nice, one impolite. You get the point.

3. Note: singer/group does not need to know how to sing, they need to move reasonably on the scene, the rest autotune and computers will handle easily.

So, given the process, AI singer is just a little bit different "music" production process, not so much different from the one used up to date except that you don't need autotune anymore.

Luckily there are still people who do music for the sake of doing music and it really stands out as compared to 80% of fodder for listeners that is on YT, radio, Spotify.