The band Yacht used AI to write an album called Chain Tripping that's really good IMO. They transcribed their old music to MIDI, fed it to an AI, had it generate short snippets of new MIDI, and then cut and paste those bits to get a score, which they performed.

I suspect the drums and bass are human-written, as they seem more coherent and "whole song-aware" than the other parts, but I have no way to confirm that.

https://www.kcrw.com/news/shows/press-play-with-madeleine-br...