Yes, there are many use cases here. If we're talking composing something entirely by itself, start to finish, the technology is nowhere near there (at least by my subjective music taste standards). We may not need self-awareness to get there, but we'll probably need something closer to AGI.

But I could think of many ways existing ML could help producers and composers while they're working. They can present possibilities and alternatives that the composer can choose from; they can find interesting combinations and permutations and patterns; they can potentially learn from your workflow and save you time in the future, etc.

I kind of have some ideas of how to develop applications like these. Maybe I should pursue them; although I currently work in a totally unrelated field.