Watch the Nashville "Drone" Chords online guitar lesson by Denny Sarokin from Songwriter's Guide to Great Guitar

I also refer to them as the “Super Secret Songwriter’s Chords” - G - C(add)9 - Dsus. - G

Adding mutual treble string notes to this variation on the I -IV -V progression gives a sustained, “drone” feel, and less tone movement makes them better “cushion chords” for the melody.

We can also mix in minor chords with similar inversions - G - Em7 - C9 - Am7 - Dsus. - D / F# - G