Chord Naming variations:
G# ninth flat five, G#9b5, G#9(-5), G#9(b5), G#7/9(b5)
Ab ninth flat five, Ab9b5, Ab9(-5), Ab9(b5), Ab7/9(b5)
This chord is a 7/b5 chord (root, major third, flat five, minor seventh) with added a major 9th.
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The Nashville Numbering System is a method that denotes chords with the scale degree numbers. It's very useful for describing chord progressions, transposing songs, improvisation, and can be understood without too much music theory knowledge. This article shows you in details how the Nashville Number System works..
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