In my textbook there is a natural sign in front of the subtonic chord.
Why is the VII chord in minor called "natural" 7 with a natural sign in front and the diminished chord built on the raised 7 just called vii°? Shouldn't the natural VII chord from natural minor be called bVII since it is built on a minor 7th interval up from the tonic?
This chord also comes up in major so if it has the same name it makes more sense. Also, if you are going to call VII the natural one because it occurs in the natural minor scale then surely vii° should be called #vii°?