They examples I gave you for the song Greensleeves represent something that is totaly Diatonic and in a natural scale.(Except for the brief harmonic minor). You said that you wanted to write songs like this. You used Greensleeves and Scarebarough Fair as references. These songs are not at all Phrygian or modal to the extent you are saying now.They are modal only to the extent of the most basic level of Theory. Now you are saying that you want to write stuff that is not diatonic? Is that what you are saying? Cause that is a different thing.