D add chords
D add chords for piano with keyboard diagram.
Explanation: The Dadd9 and Dadd2 are four-note chords. Dadd2 is sometimes written as D2.
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: D - F# - A - E
Notes: D - E - F# - A