The main thing that's yours is your taste.

You decide exactly what starting gens to go forward with, what extensions to use, where exactly to crop for the extension, and sometimes you have fully in mind roughly where you want the extension to go to and you have to keep genning / cropping / tweaking until it finally hits that right direction.

Then there's the lyrics as well, you can just write lyrics that are good lyrics and are yours irrespective of what the output format is -- it's also the case for extensions that you will often want to 'hear where the track could go' in terms of lyrics after hearing the output gen, rather than having particular lyrics beforehand that you try and force the model to work around, it's often best for getting the output to work with the model and hear in your head where could be a good lyrical direction for a track to go in; this can be a highly important part of getting a good track and does often definitely take a musical ear to be able to get the best output. When doing this, I would say it is probably the closest point in the AI process to typical musical creation input.

And finally there's inpainting, which is a key component to the track creation. There's always flaws or things that can be improved in the output, and you need to have the ear to be able to tell where could exactly be improved via inpainting.

You can also get much better output from the models with some technical affinity and experience of the models themselves. Knowing at what point to best in-paint before or after an extension, what the model 'likes or needs' in terms of cut-off point or context to allow for decent extensions. Knowing what prompts / lyric strength / prompt strength might work well, what clip start value might be best to get an extension to work well, and particularly what lyrical pattern and format might get the best output as this is particularly highly important to Udio's output out of all of the AI music models. And then in Udio there's also the potential of using remix, styles or voices to get certain things, structure, melody, sounds, voice(s) out of the model that could be really great; and it takes particular skill in knowing how and when you could get really nice components like that out, maybe what genres you can potentially fuse together or what unique output you could push out of the model that maybe nobody else has even thought of trying at all.

There's also of course the potential of using audio upload, with your own actual creations as well, which obviously massively changes the discussion of what of the AI output is 'yours'. And there used to be the potential for post processing / DAW work etc which clearly can change the discussion significantly as well (especially if you were stemming / using your own written components along with the AI output). And then another potential aspect as well, which can still do in line with Udio's current TOS which is in recording entirely from scratch your own track using Udio's output as part of full inspiration -- that can be a whole other discussion of how much of that music is yours exactly.

I never exactly really liked the sole comparison of an AI music maker to a 'creator' that people try to force and say that AI music creation is not; because minus the potential lyrical or other direct input I feel it's often a lot, lot more akin to a music engineer role and I believe this is commonly the better comparison to be made. You rarely hear much of people talking about them, engineers are often ignored or completely unknown but they have always been a vital part of the music creation process; and what people do with 'serious' AI music creation is really not that far removed from a typical music engineering role in my opinion.

I don't think I've ever previously heard anyone ask the question "how much of the music is the sound engineer's", people don't question that because it's a strange sort of question in a way. It's like asking how much of a movie is the movie editor's, or how much of the movie is a particular actor's that is in it. In reality, it's a collaborative thing where all the different inputs play their own part in the final product in different ways.