The example below shows variations on the E (highest sounding) string. These extra notes add variety to the sound and give an opportunity for hammer-ons and pull-offs. It is amazing how many riffs can be made out of the D chord and the extra notes on the first string.
|The above chords are played in the order that you see them.
Adding an alternating bass, as below, increases the variety and of course, makes it more difficult to play!
Acoustic Guitar Notes of Interest.
There are many different shapes of acoustic guitar and in the Gibson acoustic range there are: super jumbo, jumbo, square shoulder, round shoulder, small body, contemporary (single cutaway) and archtop (jazz).