There are completely fake bands, who are 'on tour', 'giving interviews', cranking out albums. Like "Shunned at a Funeral" [0] for instance, an AI Christian rock band. Mentioning nowhere that it is all fake.
Here is a band member of the real band "Wings of Pegasus" who takes a closer look at these shenanigans in "Are you sure your favourite band is real?" [1]
Not unlike Buckethead, they seemed to prefer avoiding the direct spotlight of fame, but they still wanted to create these things and put their thoughts, feeling, and original aesthetic out there in the world.
...all of which is to say "except for the AI part" is a pretty big exception.
Here is a band member of the real band "Wings of Pegasus" who takes a closer look at these shenanigans in "Are you sure your favourite band is real?" [1]
[0] https://www.youtube.com/@ShunnedataFuneral
[1] https://www.youtube.com/watch?v=tKOtpdDzwyA