do you have any idea on what percentage of musicians use AI to create the song and then also create the sheet music so they can play it themselves? That seems like a decent workflow, use AI to get the song right, and then record yourself playing it with you're own creative tweaks. That's kind of how I do AI assisted coding.

There are some composers who use a workflow like this - Suno is a scratchpad which can be used to quickly trial ideas, clarify concepts with collaborators, etc. don't think it's common, either among composers, or Suno users at large

I would guess it’s significantly below 1%

Sounds dystopian. If I was tasked with designing hell for musicians, I would be inspired.

I assume you're not a musician, because that sounds insane. If you're good enough to play at full speed from brand new sheet music, then you don't need the AI. Playing from sheet music isn't like typing.