A simple chord accompaniment in D A A

In D A A, using the finger- chord style method, I have found that a simple chord accompaniment tabbed: D= 530, G= 630 & A= 404  is useful especially when chord accompaniment is used with singing.To help my new students learn these chord changes  I have them use a chord progression sounding four D's, four G's, four A's, and a single D to end.