To play the Aadd9 chord, place the middle finger on the 2nd fret of the top g-string, index finger on the 1st fret of the C-string, and ring finger on the 2nd fret of the bottom A-string. Let the other string ring open.
The Aadd9 chord, sometimes referred to as an Asus2 chord, contains the notes A-C#-E-B.
To build an Aadd9 chord, take the major triad formula (1-3-5) and add in the theoretical ninth scale degree (1-3-5-9) using the A major scale, which has the notes A, B, C#, D, E, F#, G#.
Notice how a major scale has just seven notes. How do we get the ninth scale degree? Repeat the scale and count nine notes:
A, B, C#, D, E, F#, G#, A, B, C#, D, E, F#, G#
Note: The ninth scale degree is underlined.
Identify the first, third, fifth, and ninth scale degrees in the A major scale which are A-C#-E-B.
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