- Nov 11, 2019
Yes it is the A9 consists of the notes A, C#, G, B and E, if you take out the A you got yourself a C#m7b5. They are substitutions of each other. You could also consider an A9 as a C#m7b5/A for example.So the a9 is the same thing as the c#m7b5? and why is this?