The G chord isn't played in the A section. As soon as the B section starts, it is introduced. This creates a stark contrast between the two sections. Add to that a melody that focuses on the 7th tone of the G chord and you get a very interesting and unique fiddle tune. One thing that we'll use in this arrangement of Chinquapin Hunting to add to this contrast is restraint. In staying away from hammers and pulls in the A section and introducing them in the B, we go from staccato to legato. When combined with the chord changes and melody this helps to add to the contrast. It keeps things interesting, for you, and for the listener.