I would offer a counter point: Chat GPT uses text, which is analogous to the MIDI of spoken language. Now, what's to prevent a speech to text and text to speech AI slapped on both ends to make it audibly conversational? Or train the franken-model model end to end in one monolithic model in hopes that it might make other interesting connections.

That being said I have seen very little in the AI transcription space (Listening to music, and outputting legible sheet music while identifying instruments) especially when it comes to multi-instrument music. I've also seen very little in the midi generation space aside from what you mentioned.

It would be nice to see midi to midi AI remixes, analogous to how Chat GPT can (sort of) turn wikipedia into rap lyrics.