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.

Aadd9

Aadd9 chord diagram
Notes: A - C# - E - B

Aadd2

Aadd2 chord diagram
Notes: A - B - C# - E

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A chord categories

A Am A7 Am7 Amaj7 A6 Am6 A6/9 A5 A9 Am9 Amaj9 A11 A13 Aadd A7-5 A7+5 Asus Adim Aaug