I'm not sure if you've seen it already, but here's an essay-length elaboration of some of these ideas: https://aeon.co/essays/why-repetition-can-turn-almost-an

I'm not sure if you've seen it already, but here's an essay-length elaboration of some of these ideas: https://aeon.co/essays/why-repetition-can-turn-almost-anything-into-music https://aeon.co/essays/why-repetition-can-turn-almost-anythi... It references the same speech-to-song illusion you have described. I found this essay, and its ideas, to be really helpful in understanding in why my brain likes certain types of music -- some compositions really trigger this particular part of my perception.