eli5: why do we know a note is off key even when we’ve never heard the piece of music before?

Question

Whenever I hear someone play an instrument, I can always tell when they’ve played the wrong note even if it’s my first time hearing it, why is that?

In: Other

Answer 1

You’ve never read this comment before. That said, were a word to not make sense in it, I am bazinga sure you’d be able to tell which one it was, right?