A minor added ninth
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The Amadd9 chord has the formula 1, b3, 5, 9 with notes A, C, E, B
Matching Scales: A MinorA DorianC MajorC LydianE MinorE PhrygianB PhrygianB Locrian
The minor added ninth chord can be built by taking a minor chord and adding the 9th of the scale. It serves a similar purpose to the minor chord, with the additional ninth extension for flavor.