Harmonic minor keys are ... different kinds of chords. These chromatic alterations have been the basis of a whole range of musical styles. For example, the triads in C major are as follows ...

But I’ll also use notes from the A minor pentatonic scale (A, C, D, E, G) and the A blues ... In bar 2, I imply, or describe, an A9 chord sound (A, C#, E, G, B) with the notes G, B, C# and ...