You do not make the reasoning clear, why, in the key of G major the seventh is stated as an F sharp as opposed to G flat. Or why in the key of F there is a B flat and Not an A sharp. Is there a rule to this that you did not mention, or are we supposed to infere this out of thin air. Or are we just supposed to accept what you say verbatim. If the latter is the case, then you better describe all the other major keys.