As an amateur musician, I'd like tools that help me be more productive musically - those that complement my skills (whatever they may be). All the things you mentioned above, namely, ability to score a melody via a simple hum, transfer to various instruments, generate proper responses to calls, generate melodies within a framework, etc., all these would be super valuable to me.
I'm an OK guitar + bass + keyboard player, I'd LOVE to have an AI assistant that accompanies along. That would make my own jammin' so much richer.
I dont think we have seen the end of AI-driven tools in music-tech yet. I'm cautiously hopeful.
That said, there is a difference to images in that music also has a "symbolic" level to it that is closer to text than images [1]. There's other work out there that uses LLM-type tools for direct melody generation (no audio). And of course, there's lyrics. I do expect commercial tools to start integrating all these capabilities gradually, it's just a matter of time.
[1] I guess there's also vector images (like SVG) - I've seen work in generating those as well, though it's less mature than directly generating pixels.
For example, I tend to think of "composition" and "synthesis" as two very different topics.
One VST could spit out chords or melodies (not a common VST) whereas another could render those sounds (very common VST)
Story Jam lets you design chord progressions without needing to know about music theory, instead offering intuitive terms like "lightness", "darkness", "drifting" and "roaming". They mean about what you think they mean.
I'm planning a "Show HN" post for tomorrow morning EST with more details. But you can get the sneak peek here :)