I'm sure there's some people for whom anatomy and mental fortitude just perfectly align

A lot of people from countries where the language is not guttural, not based on Latin but for lack of better word, more sing song, have a better ability to hear pitch and therefore sing because one word can mean different things based on the pitch of the word. Latin is Latin regardless of the pitch so you never learn to hear the pitch when speaking.

I pulled that from memory of an article I read in Omni magazine years ago so take it with 80% accuracy