As a musician I can definitely tell when a song has been arranged by AI but performed by humans. There are a couple of chart-toppers done this way. I won't give up the ghost, though ;)
I’m also curious! Are you keeping a secret because you don’t want people to try to find work arounds, kind of like prompting LLMs not to say “delve” or “tapestry” in order to make your AI writing sound less like AI? Or is it something else?