A# added ninth
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The A#add9 chord has the formula 1, 3, 5, 9 with notes A#, D, F, C
Matching Scales: A# MajorA# MixolydianD MinorD PhrygianF MajorF DorianC MinorC Dorian
The added ninth chord can be built by taking a major chord and adding the 9th of the scale. It serves a similar purpose to the major chord, with the additional extension for color or harmonizing with other instruments.