A dominant ninth
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The A9 chord has the formula 1, 3, b7, 9 with notes A, C#, G, B
Matching Scales: A MixolydianA HinduC# LocrianC# ArabicG LydianG ArabicB MinorB Hindu
The dominant ninth chord is mostly used in funk, blues and some rock music. It is usually played without the 5th on the ukulele.