I don't know if this is a good question, so I'm putting it here instead. Why can I sing in key? I sing and the notes come out mostly okay and I have no idea how I do that. It just works. How is it working?

@StaceyAnne I think you can ask about that. It's actually a really important question, essentially about why most people, regardless of level of musical training, can sing within diatonic keys. It's likely to be to do with culture, as we all hear music around us; but it may also be culture-specific (in other words, different cultures don't necessarily sing using the same kind of scales). I think there might already be some questions and answers on Music.SE about this!!

@bob Okay, ill do some research and searching and put together a more comprehensive question. I've been thinking about this quite a lot

I don't know if it's a duplicate (I did search) but there it is.