A add chords
A add chords for piano with keyboard diagram.
Explanation: The Aadd9 and Aadd2 are four-note chords. Aadd2 is sometimes written as A2.
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: A - C# - E - B
Notes: A - B - C# - E