G add chords
G add chords for piano with keyboard diagram.
Explanation: The Gadd9 and Gadd2 are four note chords. Gadd2 is sometimes written as G2.
Theory: Both chords contain the same notes, but the added notes belong to different octaves which are the ninth and the second notes in the scale.
Notes: G - B - D - A
Notes: G - A - B - D