The Dadd4 shapes in this lesson can be used in several different keys, but most commonly used as the 5th chord in the key of G Major. The beauty and complexity of these shapes stems from the 1/2 step interval between the F# on the 4th string and the open G string which is present in all shapes below.
"add4" is different than "sus4" (often referred to as "sus") because it includes both the 4th chord tone as well as the 3rd chord tone. Explore the chord tones in the diagrams below.
Dadd4 is constructed with the 1st, 3rd, 4th, and 5th notes of the D Major scale