To play the Bbadd9 chord, place the ring finger on the 3rd fret of the top g-string, middle finger on the 2nd fret of the C-string, index finger on the 1st fret of the E-string, and little finger on the 3rd fret of the bottom A-string.
The Bbadd9 chord, also known as an A#add9, but sometimes referred to as a Bbsus2 or A#sus2 chord, contains the notes Bb-D-F-C.
To build a Bbadd9 chord, take the major triad formula (1-3-5) and add in the theoretical ninth scale degree (1-3-5-9) using the Bb major scale, which has the notes Bb, C, D, Eb, F, G, A.
Notice how a major scale has just seven notes. How do we get the ninth scale degree? Repeat the scale and count nine notes:
Bb, C, D, Eb, F, G, A, Bb, C, D, Eb, F, G, A
Note: The ninth scale degree is underlined.
Identify the first, third, fifth, and ninth scale degrees in the Bb major scale which are Bb-D-F-C.
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